editorconfig: don't remove trailing whitespace in XML files #6178

Job	Run time
Cross compiler for s390x	32m 49s
Test in OpenBSD	8m 50s
testinstall - - ubuntu-latest	5m 35s
teststandard - - ubuntu-latest	20m 34s
testmanuals - - ubuntu-latest	6m 3s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	8m 30s
testpackages testinstall-loadall - - ubuntu-latest	26m 20s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	6m 28s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	18m 35s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	8m 8s
testmockpkg testinstall testworkspace - BOOTSTRAP_MINIMAL=yes - macos-latest	7m 40s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	30m 31s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 53s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 33s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-20.04	5m 21s
testmockpkg testinstall - - windows-2019	17m 41s
Send Slack notification on status change	0s
	3h 32m 31s

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