Only define gap_jl_boundp when it is needed #5790

Job	Run time
Cross compiler for s390x	27m 23s
Test in OpenBSD	7m 36s
testinstall - - ubuntu-latest	4m 35s
teststandard - - ubuntu-latest	19m 10s
testmanuals - - ubuntu-latest	5m 46s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 50s
testpackages testinstall-loadall - - ubuntu-latest	26m 33s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	5m 42s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	18m 8s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	7m 36s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	3m 57s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	27m 5s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 32s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 21s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-20.04	5m 3s
testmockpkg testinstall - - windows-2019	16m 19s
Send Slack notification on status change	2s
	3h 10m 38s

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