Stop using GNU libtool for linking GAP and libgap #4946

Job	Run time
testinstall - - ubuntu-latest	4m 33s
teststandard - - ubuntu-latest	31m 36s
testmanuals - - ubuntu-latest	5m 41s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 20s
testpackages testinstall-loadall - - ubuntu-latest	20m 38s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	5m 25s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	29m 6s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	6m 47s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	6m 1s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	21m 54s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 0s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	3m 22s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug --disable-Werror" - ubuntu-20.04	5m 7s
testmockpkg testinstall - - windows-2019	14m 59s
Send Slack notification on status change	0s
	2h 45m 29s

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