upstream #1068

Job	Run time
html5lib-tests	52s
jruby-head	1m 16s
ruby-head (ubuntu, enable)	44s
ruby-head-valgrind (disable)	6m 52s
ruby-head (ubuntu, disable)	40s
truffleruby-head (--disable-system-libraries --disable-static)	3m 21s
xmlsoft-head (ubuntu)	1m 35s
ruby-head (windows, enable)	3m 13s
xmlsoft-head (windows)	10m 45s
truffleruby-head (--disable-system-libraries --enable-static)	5m 27s
xmlsoft-head-valgrind	6m 25s
xmlsoft-head (macos)	1m 25s
ruby-head (windows, disable)	3m 27s
truffleruby-head (--enable-system-libraries)	2m 52s
ruby-head (macos, enable)	31s
ruby-head (macos, disable)	1m 23s
	50m 48s

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