On Windows, zlib.h cannot be found when tmpdir contains tilde

[pmq20]

2020-07-18T22:07:13.4333123Z -> CI=true ENCLOSE_IO_USE_ORIGINAL_RUBY=1 MAKE=nmake CL=/MP ENCLOSE_IO_RUBYC_1ST_PASS=1 ENCLOSE_IO_RUBYC_2ND_PASS='' nmake 
2020-07-18T22:07:13.4642072Z 
2020-07-18T22:07:13.4793966Z Microsoft (R) Program Maintenance Utility Version 14.26.28806.0
2020-07-18T22:07:13.4794721Z Copyright (C) Microsoft Corporation.  All rights reserved.
2020-07-18T22:07:13.4811992Z 
2020-07-18T22:07:13.7429830Z 	BASERUBY = D:\RUBYIN~1.1-1\bin\ruby.exe
2020-07-18T22:07:13.7430502Z 	CC = cl -nologo
2020-07-18T22:07:13.7431658Z 	LD = cl -nologo
2020-07-18T22:07:13.7432798Z 	LDSHARED = cl -nologo -LD
2020-07-18T22:07:13.7434244Z 	CFLAGS = -MD -Zi -W2 -wd4100 -wd4127 -wd4210 -wd4214 -wd4255 -wd4574  -wd4668 -wd4710 -wd4711 -wd4820 -wd4996  -we4028 -we4142 -we4047 -O2sy- -Zm600   -MD /Ox  -IC:/Users/RUNNER\~1/AppData/Local/Temp/rubyc/zlib -IC:/Users/RUNNER\~1/AppData/Local/Temp/rubyc/ruby-2.7.1a
2020-07-18T22:07:13.7435944Z 	XCFLAGS = -DRUBY_EXPORT -I. -I.ext/include/x64-mswin64_140 -IC:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/include -IC:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a -IC:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/enc/unicode/12.1.0  -MD /Ox  -IC:/Users/RUNNER\~1/AppData/Local/Temp/rubyc/zlib -IC:/Users/RUNNER\~1/AppData/Local/Temp/rubyc/ruby-2.7.1a  -DCANONICALIZATION_FOR_MATHN
2020-07-18T22:07:13.7436942Z 	CPPFLAGS =  -D_WIN32_WINNT=0x0600  
2020-07-18T22:07:13.7438324Z 	DLDFLAGS = -incremental:no -debug -opt:ref -opt:icf  -libpath:C:\\Users\\RUNNER\~1\\AppData\\Local\\Temp\\rubyc\\zlib C:/Users/RUNNER\~1/AppData/Local/Temp/rubyc/zlib/zlib.lib Advapi32.lib -dll
2020-07-18T22:07:13.7440065Z 	SOLIBS = 
2020-07-18T22:07:13.7441763Z 	LANG = 
2020-07-18T22:07:13.7442879Z 	LC_ALL = 
2020-07-18T22:07:13.7444052Z 	LC_CTYPE = 
2020-07-18T22:07:13.7445996Z 	MFLAGS = -l
2020-07-18T22:07:13.7598197Z Creating config.h
2020-07-18T22:07:13.8052176Z .ext\include\x64-mswin64_140\ruby\config.h updated
2020-07-18T22:07:13.8240102Z Creating config.status
2020-07-18T22:07:13.8552472Z compiling C:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/main.c
2020-07-18T22:07:13.8660185Z main.c
2020-07-18T22:07:13.8910513Z C:\Users\RUNNER~1\AppData\Local\Temp\rubyc\build_pass_1\.ext\include\x64-mswin64_140\ruby/config.h(22): warning C4117: macro name '_INTEGRAL_MAX_BITS' is reserved, '#define' ignored
2020-07-18T22:07:16.6782943Z C:\Users\runneradmin\AppData\Local\Temp\rubyc\ruby-2.7.1a\enclose_io_win32.h(24): warning C4005: 'stat': macro redefinition
2020-07-18T22:07:16.6792191Z C:\Users\runneradmin\AppData\Local\Temp\rubyc\ruby-2.7.1a\include\ruby/win32.h(196): note: see previous definition of 'stat'
2020-07-18T22:07:16.6792697Z C:\Users\runneradmin\AppData\Local\Temp\rubyc\ruby-2.7.1a\enclose_io_win32.h(25): warning C4005: 'fstat': macro redefinition
2020-07-18T22:07:16.6793089Z C:\Users\runneradmin\AppData\Local\Temp\rubyc\ruby-2.7.1a\include\ruby/win32.h(203): note: see previous definition of 'fstat'
2020-07-18T22:07:16.7238822Z compiling C:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/dmydln.c
2020-07-18T22:07:16.7347864Z dmydln.c
2020-07-18T22:07:16.7488746Z C:\Users\RUNNER~1\AppData\Local\Temp\rubyc\build_pass_1\.ext\include\x64-mswin64_140\ruby/config.h(22): warning C4117: macro name '_INTEGRAL_MAX_BITS' is reserved, '#define' ignored
2020-07-18T22:07:17.1631921Z compiling miniruby.rc
2020-07-18T22:07:17.1901091Z generating C:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/miniprelude.c
2020-07-18T22:07:17.3311025Z C:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/miniprelude.c updated
2020-07-18T22:07:17.3518533Z compiling C:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/miniinit.c
2020-07-18T22:07:17.3627141Z miniinit.c
2020-07-18T22:07:17.3866075Z C:\Users\RUNNER~1\AppData\Local\Temp\rubyc\build_pass_1\.ext\include\x64-mswin64_140\ruby/config.h(22): warning C4117: macro name '_INTEGRAL_MAX_BITS' is reserved, '#define' ignored
2020-07-18T22:07:17.9080520Z compiling C:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/dmyext.c
2020-07-18T22:07:17.9189572Z dmyext.c
2020-07-18T22:07:17.9577726Z compiling C:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/autoupdate_autoupdate.c
2020-07-18T22:07:17.9690361Z autoupdate_autoupdate.c
2020-07-18T22:07:18.5720051Z C:/Users/RUNNER~1/AppData/Local/Temp/rubyc/ruby-2.7.1a/autoupdate_autoupdate.c(10): fatal error C1083: Cannot open include file: 'zlib.h': No such file or directory
2020-07-18T22:07:18.5792165Z NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.26.28801\bin\HostX64\x64\cl.EXE"' : return code '0x2'
2020-07-18T22:07:18.5792562Z Stop.
2020-07-18T22:07:18.5813577Z Failed running [{"CI"=>"true", "ENCLOSE_IO_USE_ORIGINAL_RUBY"=>"1", "MAKE"=>"nmake", "CL"=>"/MP", "ENCLOSE_IO_RUBYC_1ST_PASS"=>"1", "ENCLOSE_IO_RUBYC_2ND_PASS"=>nil}, "nmake "]
2020-07-18T22:07:18.6017762Z rake aborted!
2020-07-18T22:07:18.6018875Z Command failed with status (1): [D:/rubyinstaller-2.7.1-1-x64/bin/ruby.exe ...]
2020-07-18T22:07:18.6019201Z D:/a/ruby-packer/ruby-packer/Rakefile:24:in `block in <top (required)>'
2020-07-18T22:07:18.6019468Z Tasks: TOP => default => test => test:roundtrip => rubyc
2020-07-18T22:07:18.6019945Z (See full trace by running task with --trace)
2020-07-18T22:07:18.6440613Z ##[error]Process completed with exit code 1.
2020-07-18T22:07:18.6603588Z Post job cleanup.
2020-07-18T22:07:29.0736360Z [command]"C:\Program Files\Git\bin\git.exe" version
2020-07-18T22:07:29.0905885Z git version 2.27.0.windows.1
2020-07-18T22:07:29.0969494Z [command]"C:\Program Files\Git\bin\git.exe" config --local --name-only --get-regexp core\.sshCommand
2020-07-18T22:07:29.1171518Z [command]"C:\Program Files\Git\bin\git.exe" submodule foreach --recursive "git config --local --name-only --get-regexp 'core\.sshCommand' && git config --local --unset-all 'core.sshCommand' || :"
2020-07-18T22:07:29.5405106Z [command]"C:\Program Files\Git\bin\git.exe" config --local --name-only --get-regexp http\.https\:\/\/github\.com\/\.extraheader
2020-07-18T22:07:29.5563199Z http.https://github.com/.extraheader
2020-07-18T22:07:29.5604265Z [command]"C:\Program Files\Git\bin\git.exe" config --local --unset-all http.https://github.com/.extraheader
2020-07-18T22:07:29.5804518Z [command]"C:\Program Files\Git\bin\git.exe" submodule foreach --recursive "git config --local --name-only --get-regexp 'http\.https\:\/\/github\.com\/\.extraheader' && git config --local --unset-all 'http.https://github.com/.extraheader' || :"
2020-07-18T22:07:30.0197771Z Cleaning up orphan processes

[pmq20]

this was worked around in 0827cb1