upstream #1070

Job	Run time
ruby-head-valgrind (disable)	9m 11s
xmlsoft-head (ubuntu)	2m 1s
xmlsoft-head (windows)	8m 32s
jruby-head	1m 18s
html5lib-tests	46s
xmlsoft-head (macos)	1m 22s
ruby-head (ubuntu, enable)	58s
ruby-head (ubuntu, disable)	3m 39s
xmlsoft-head-valgrind	6m 37s
ruby-head (windows, enable)	3m 14s
ruby-head (windows, disable)	5m 28s
truffleruby-head (--disable-system-libraries --disable-static)	5m 10s
ruby-head (macos, enable)	33s
truffleruby-head (--disable-system-libraries --enable-static)	3m 23s
ruby-head (macos, disable)	2m 45s
truffleruby-head (--enable-system-libraries)	2m 51s
	57m 48s

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