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.

Also, a few minor changes that are required to compile ABC under moder compilers.

This fix addresses an issue I saw with the ASAP7 liberty files and
ABC. ASAP7 lists internal pins in its liberty file which ABC's liberty
parser doesn't account for. This causes an assert to be triggered. This
fix simply adds interal pins to the ignore list.