Always enable pthread flags #4514

Job	Run time
testinstall - - ubuntu-latest	21m 23s
teststandard - - ubuntu-latest	1h 0m 37s
testmanuals - - ubuntu-latest	40m 44s
testexpect testmockpkg testspecial test-compile testlibgap testkernel - - ubuntu-latest	20m 43s
testpackages testinstall-loadall - - ubuntu-latest	55m 36s
makemanuals testmakeinstall - GAPPREFIX=/tmp/gapprefix CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	8m 14s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	1h 0m 25s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	42m 37s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	6m 50s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	1h 0m 20s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	6m 16s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 37s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug --disable-Werror" - ubuntu-20.04	15m 51s
testmockpkg testinstall - - windows-2019	32m 21s
Send Slack notification on status change	0s
	7h 16m 34s

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