upstream #1074

Job	Run time
xmlsoft-head-valgrind	6m 27s
ruby-head (ubuntu, enable)	40s
html5lib-tests	55s
ruby-head (ubuntu, disable)	41s
jruby-head	1m 2s
ruby-head-valgrind (disable)	5m 33s
ruby-head (windows, enable)	3m 4s
ruby-head (windows, disable)	3m 23s
truffleruby-head (--disable-system-libraries --disable-static)	3m 14s
xmlsoft-head (ubuntu)	1m 59s
truffleruby-head (--disable-system-libraries --enable-static)	5m 26s
xmlsoft-head (windows)	9m 27s
truffleruby-head (--enable-system-libraries)	2m 45s
xmlsoft-head (macos)	32s
ruby-head (macos, enable)	39s
ruby-head (macos, disable)	33s
	46m 20s

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