kernel: close streams after internal exception #6079

Job	Run time
Cross compiler for s390x	28m 44s
Test in OpenBSD	8m 2s
testinstall - - ubuntu-latest	4m 45s
teststandard - - ubuntu-latest	19m 41s
testmanuals - - ubuntu-latest	6m 23s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 48s
testpackages testinstall-loadall - - ubuntu-latest	26m 14s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	6m 30s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	18m 9s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	7m 31s
testmockpkg testinstall testworkspace - BOOTSTRAP_MINIMAL=yes - macos-latest	6m 6s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	29m 12s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	5m 8s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 12s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-20.04	4m 52s
testmockpkg testinstall - - windows-2019	16m 25s
Send Slack notification on status change	0s
	3h 18m 42s

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