upstream #1047

Job	Run time
jruby-head	1m 5s
html5lib-tests	42s
ruby-head-valgrind (disable)	5m 18s
ruby-head (ubuntu, enable)	42s
ruby-head (ubuntu, disable)	42s
truffleruby-head (--disable-system-libraries --disable-static)	3m 8s
ruby-head (windows, enable)	5m 0s
xmlsoft-head (ubuntu)	1m 41s
truffleruby-head (--disable-system-libraries --enable-static)	3m 15s
ruby-head (windows, disable)	2m 54s
xmlsoft-head (windows)	10m 17s
truffleruby-head (--enable-system-libraries)	2m 39s
ruby-head (macos, enable)	41s
xmlsoft-head (macos)	1m 25s
ruby-head (macos, disable)	1m 10s
xmlsoft-head-valgrind	6m 32s
	47m 11s

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