upstream #985

Job	Run time
jruby-head	1m 17s
ruby-head-valgrind (enable)	6m 59s
html5lib-tests	45s
ruby-head (ubuntu, enable)	40s
ruby-head-valgrind (disable)	5m 47s
ruby-head (ubuntu, disable)	3m 34s
truffleruby-head (--disable-system-libraries --disable-static)	44s
ruby-head (windows, enable)	5m 57s
xmlsoft-head (ubuntu)	2m 20s
xmlsoft-head-valgrind	6m 32s
truffleruby-head (--disable-system-libraries --enable-static)	2m 53s
ruby-head (windows, disable)	8m 44s
xmlsoft-head (windows)	9m 18s
truffleruby-head (--enable-system-libraries)	47s
ruby-head (macos, enable)	2m 44s
xmlsoft-head (macos)	1m 32s
ruby-head (macos, disable)	36s
	1h 1m 9s

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