Fixes for 22 04

[tinselcity]

What

catch updated to catch2 (due to glibc changes for MINSIGSTKSZ define) issue.

ref:

• https://sourceware.org/git/?p=glibc.git;a=commit;h=6c57d320484988e87e446e2e60ce42816bf51d53
• Catch2 fails to compile on Fedora Rawhide catchorg/Catch2#2178

cmake updates and cleanup for 22.04 compatibility

of note is

# ------------------------------------------------------------------------------
# fix for error
# ...
# /usr/bin/ld: /tmp/ccJLmlSQ.ltrans0.ltrans.o: relocation R_X86_64_32S against
# `.rodata' can not be used when making a PIE object; recompile with -fPIE
# ...
# ref:
# https://github.com/kermitt2/pdfalto/issues/41#issuecomment-479881065
# ------------------------------------------------------------------------------
set(CMAKE_EXE_LINKER_FLAGS "-no-pie")

Seems like libunwind-dev was compiled w/o -fPIC / -fPIE
see:

>readelf --relocs /usr/lib/x86_64-linux-gnu/libunwind.a | awk '$3~/^R_/ && $5!~/^\.debug/{print $3}' |sort -u
R_X86_64_32
R_X86_64_32S
R_X86_64_64
R_X86_64_DTPOFF32
R_X86_64_GOTPCREL
R_X86_64_PC32
R_X86_64_PLT32
R_X86_64_REX_GOTP
R_X86_64_TPOFF32

ref: https://unix.stackexchange.com/a/89220