upstream #1016

Job	Run time
html5lib-tests	53s
jruby-head	1m 2s
ruby-head (ubuntu, enable)	49s
ruby-head-valgrind (disable)	6m 22s
ruby-head (ubuntu, disable)	53s
ruby-head (windows, enable)	3m 13s
xmlsoft-head (ubuntu)	1m 51s
xmlsoft-head-valgrind	6m 20s
ruby-head (windows, disable)	3m 19s
xmlsoft-head (windows)	10m 54s
truffleruby-head (--disable-system-libraries --disable-static)	3m 9s
ruby-head (macos, enable)	33s
xmlsoft-head (macos)	1m 47s
truffleruby-head (--disable-system-libraries --enable-static)	3m 19s
ruby-head (macos, disable)	1m 6s
truffleruby-head (--enable-system-libraries)	2m 35s
	48m 5s

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