upstream #1073

Job	Run time
html5lib-tests	49s
jruby-head	1m 4s
ruby-head-valgrind (disable)	5m 31s
ruby-head (ubuntu, enable)	41s
ruby-head (ubuntu, disable)	48s
xmlsoft-head (ubuntu)	1m 33s
ruby-head (windows, enable)	2m 47s
xmlsoft-head-valgrind	6m 28s
truffleruby-head (--disable-system-libraries --disable-static)	5m 29s
xmlsoft-head (windows)	9m 13s
ruby-head (windows, disable)	2m 59s
truffleruby-head (--disable-system-libraries --enable-static)	3m 46s
xmlsoft-head (macos)	1m 27s
ruby-head (macos, enable)	34s
truffleruby-head (--enable-system-libraries)	2m 39s
ruby-head (macos, disable)	38s
	46m 26s

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