upstream #1103

Job	Run time
xmlsoft-head (ubuntu)	1m 39s
xmlsoft-head (windows)	9m 27s
jruby-head	1m 11s
html5lib-tests	47s
xmlsoft-head (macos)	1m 27s
ruby-head (ubuntu, enable)	56s
ruby-head (ubuntu, disable)	3m 46s
ruby-head-valgrind (disable)	9m 9s
xmlsoft-head-valgrind	6m 56s
ruby-head (windows, enable)	3m 20s
ruby-head (windows, disable)	3m 27s
ruby-head (macos, enable)	38s
truffleruby-head (--disable-system-libraries --disable-static)	3m 16s
ruby-head (macos, disable)	3m 27s
truffleruby-head (--disable-system-libraries --enable-static)	5m 16s
truffleruby-head (--enable-system-libraries)	2m 27s
	57m 9s

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