Problem: Some tests are not valid on OpenBSD.
Solution: Add CheckNotOpenBSD, use it to skip certain tests
(Kevin Goodsell).
Test_readdirex_sort performs locale-dependent sorting. OpenBSD has
minimal locale support.
Test_stdin_no_newline hangs on OpenBSD and FreeBSD. I don't know exactly
why, but it may be due to bash not exiting at the end of the test. This
is skipped in the FreeBSD CI runs because bash is not installed.
Test_detect_fifo uses /dev/fd/ files (via process substitution) as
FIFOs. On OpenBSD the files in /dev/fd are not FIFOs.
closes: vim/vim#19351a24cb278bd
Co-authored-by: Kevin Goodsell <kevin-opensource@omegacrash.net>
Problem: CI Tests favor GTK2 over GTK3
Solution: Install GTK3 dependencies and debug packages for CI workflows,
update ASAN suppression list, update required dependency
checks for the tests (Drew Vogel)
closes: vim/vim#17253ea67ba718d
Cherry-pick test_match.vim changes from patch 9.0.0626.
Co-authored-by: Drew Vogel <dvogel@github>
