upstream #1079

Job	Run time
jruby-head	1m 11s
html5lib-tests	49s
ruby-head-valgrind (disable)	7m 47s
ruby-head (ubuntu, enable)	42s
ruby-head (ubuntu, disable)	2m 52s
truffleruby-head (--disable-system-libraries --disable-static)	3m 9s
truffleruby-head (--disable-system-libraries --enable-static)	5m 20s
ruby-head (windows, enable)	5m 18s
xmlsoft-head (ubuntu)	3m 47s
truffleruby-head (--enable-system-libraries)	2m 51s
xmlsoft-head-valgrind	6m 31s
xmlsoft-head (windows)	11m 58s
ruby-head (windows, disable)	4m 2s
xmlsoft-head (macos)	3m 50s
ruby-head (macos, enable)	33s
ruby-head (macos, disable)	2m 45s
	1h 3m 25s

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