upstream #703

Job	Run time
jruby-head	1m 12s
html5lib-tests	51s
ruby-head-valgrind (disable)	8m 31s
ruby-head (ubuntu, enable)	3m 4s
ruby-head (ubuntu, disable)	1m 25s
truffleruby-head (--disable-system-libraries --disable-static)	3m 18s
xmlsoft-head (ubuntu)	3m 55s
ruby-head (windows, enable)	3m 22s
truffleruby-head (--disable-system-libraries --enable-static)	5m 20s
xmlsoft-head-valgrind	6m 51s
xmlsoft-head (windows)	12m 11s
ruby-head (windows, disable)	6m 9s
truffleruby-head (--enable-system-libraries)	3m 4s
xmlsoft-head (macos)	3m 39s
ruby-head (macos, enable)	31s
ruby-head (macos, disable)	2m 48s
	1h 6m 11s

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