CI: fix cross compile tests #7482

Job	Run time
Cross compiler for s390x	2m 18s
Test in OpenBSD	5m 51s
testpackages testinstall-loadall - - ubuntu-latest	6m 7s
testinstall - - ubuntu-latest	6m 8s
teststandard - - ubuntu-latest	6m 7s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	6m 6s
testmanuals - - ubuntu-latest	5m 35s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-22.04	6m 7s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	5m 37s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	6m 7s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	6m 6s
testmockpkg testinstall testworkspace - BOOTSTRAP_MINIMAL=yes - macos-latest	6m 11s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-22.04	5m 21s
testmockpkg testinstall - - windows-2022	6m 2s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 7s
Send Slack notification on status change	1s
	1h 25m 51s

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