Fix compile error on targets with unsigned char

Fixes internal pin parsing error in ASAP7 liberty file.

fix windows CI => project file integration broken on windows-latest

* use windows-2019 until updated project files are usable on 2022

Signed-off-by: Stephen L Arnold <nerdboy@gentoo.org>

Add missing class names in FreeBSD-ifdefed code.

abc is failing to compile on ppc64le because char is unsigned by
default:

src/misc/extra/extraUtilMisc.c: In function ‘void abc::Extra_TruthExpand(int, int, unsigned int*, unsigned int, unsigned int*)’:
src/misc/extra/extraUtilMisc.c:1550:5: error: narrowing conversion of ‘-1’ from ‘int’ to ‘char’ inside { } [-Wnarrowing]

Build CMake on GitHub Actions

Also, resolve CMake build problems on macOS:
Pass CMAKE_OSX_SYSROOT as an environment variable SDKROOT when buildind the arch_flags executable.

Move CI to GitHub Actions.