upstream #1018

Job	Run time
jruby-head	1m 13s
html5lib-tests	47s
ruby-head-valgrind (disable)	9m 4s
ruby-head (ubuntu, enable)	51s
ruby-head (ubuntu, disable)	2m 55s
truffleruby-head (--disable-system-libraries --disable-static)	3m 22s
ruby-head (windows, enable)	5m 20s
xmlsoft-head-valgrind	6m 27s
xmlsoft-head (ubuntu)	3m 46s
ruby-head (windows, disable)	3m 18s
truffleruby-head (--disable-system-libraries --enable-static)	5m 32s
xmlsoft-head (windows)	12m 2s
ruby-head (macos, enable)	33s
truffleruby-head (--enable-system-libraries)	2m 49s
xmlsoft-head (macos)	3m 47s
ruby-head (macos, disable)	3m 29s
	1h 5m 15s

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