Enable compilation of manifpy on Linux and macOS

[traversaro]

Fix #3 .

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[traversaro]

For some reason in the regular build downloding gtest internally via CMake works fine:

[ 11%] Creating directories for 'googletest'
[ 22%] Performing download step (git clone) for 'googletest'
Cloning into 'googletest-src'...
Switched to a new branch 'v1.8.x'
Branch 'v1.8.x' set up to track remote branch 'v1.8.x' from 'origin'.
[ 33%] Performing update step for 'googletest'
HEAD is now at dea0216d Merge pull request #2083 from hugolm84/v1.8.x
[ 44%] No patch step for 'googletest'
[ 55%] No configure step for 'googletest'
[ 66%] No build step for 'googletest'
[ 77%] No install step for 'googletest'
[ 88%] No test step for 'googletest'
[100%] Completed 'googletest'
[100%] Built target googletest

While when we move manif to build two outpus (manif and manifpy), the gtest download is failing:

[ 11%] Creating directories for 'googletest'
[ 22%] Performing download step (git clone) for 'googletest'
Cloning into 'googletest-src'...
Switched to a new branch 'v1.8.x'
Branch v1.8.x set up to track remote branch v1.8.x from origin.
bash.exe: warning: could not find /tmp, please create!
[ 33%] Performing update step for 'googletest'
CMake Error at D:/bld/manif_1623773885143/work/build/test/gtest/googletest-prefix/tmp/googletest-gitupdate.cmake:25 (message):
  Failed to get the hash for HEAD:

  fatal: ambiguous argument 'HEAD^commit': unknown revision or path not in
  the working tree.

  Use '--' to separate paths from revisions, like this:

  'git <command> [<revision>...] -- [<file>...]'



NMAKE : fatal error U1077: 'D:\bld\manif_1623773885143\_build_env\Library\bin\cmake.exe' : return code '0x1'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe"' : return code '0x2'
Stop.

Not a big problem as switching to the conda-provided gtest make more sense, but definitely strange.

[traversaro]

GTest linking on Windows fails with error:

2021-06-15T16:51:35.5551222Z [ 52%] Linking CXX executable gtest_rn.exe
2021-06-15T16:51:37.0017632Z LINK: command "C:\PROGRA~2\MICROS~1\2017\ENTERP~1\VC\Tools\MSVC\1416~1.270\bin\Hostx64\x64\link.exe /nologo @CMakeFiles\gtest_rn.dir\objects1.rsp /out:gtest_rn.exe /implib:gtest_rn.lib /pdb:D:\bld\manif_1623775123530\work\build\test\rn\gtest_rn.pdb /version:0.0 /machine:x64 /INCREMENTAL:NO /subsystem:console gtest.lib kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTFILE:gtest_rn.exe.manifest" failed (exit code 1169) with the following output:
2021-06-15T16:51:37.0034722Z gtest.lib(gtest-all.cc.obj) : error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MT_StaticRelease' doesn't match value 'MD_DynamicRelease' in gtest_rn.cpp.obj
2021-06-15T16:51:37.0043657Z msvcprt.lib(MSVCP140.dll) : error LNK2005: "public: struct _Cvtvec __cdecl std::_Locinfo::_Getcvt(void)const " (?_Getcvt@_Locinfo@std@@QEBA?AU_Cvtvec@@XZ) already defined in gtest.lib(gtest-all.cc.obj)
2021-06-15T16:51:37.0045753Z msvcprt.lib(MSVCP140.dll) : error LNK2005: "protected: __cdecl std::basic_streambuf<char,struct std::char_traits<char> >::basic_streambuf<char,struct std::char_traits<char> >(void)" (??0?$basic_streambuf@DU?$char_traits@D@std@@@std@@IEAA@XZ) already defined in gtest.lib(gtest-all.cc.obj)
2021-06-15T16:51:37.0047292Z msvcprt.lib(MSVCP140.dll) : error LNK2005: "public: virtual __cdecl std::basic_streambuf<char,struct std::char_traits<char> >::~basic_streambuf<char,struct std::char_traits<char> >(void)" (??1?$basic_streambuf@DU?$char_traits@D@std@@@std@@UEAA@XZ) already defined in gtest.lib(gtest-all.cc.obj)
2021-06-15T16:51:37.0048692Z msvcprt.lib(MSVCP140.dll) : error LNK2005: "public: int __cdecl std::basic_streambuf<char,struct std::char_traits<char> >::sputc(char)" (?sputc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QEAAHD@Z) already defined in gtest.lib(gtest-all.cc.obj)
2021-06-15T16:51:37.0050054Z msvcprt.lib(MSVCP140.dll) : error LNK2005: "public: __int64 __cdecl std::basic_streambuf<char,struct std::char_traits<char> >::sputn(char const *,__int64)" (?sputn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QEAA_JPEBD_J@Z) already defined in gtest.lib(gtest-all.cc.obj)
2021-06-15T16:51:37.0062062Z msvcprt.lib(MSVCP140.dll) : error LNK2005: "protected: char * __cdecl std::basic_streambuf<char,struct std::char_traits<char> >::_Pninc(void)" (?_Pninc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IEAAPEADXZ) already defined in gtest.lib(gtest-all.cc.obj)

That seems some problem in the gtest feedstock. For now, let's just disable tests on Windows.

[traversaro]

@conda-forge-admin, please rerender

[traversaro]

Windows build is not working due to some setup.py problem, let's try to merge without python bindings support on Windows and then fix this later: #7 .

[traversaro]

@conda-forge-admin, please rerender