upstream #1055

Job	Run time
ruby-head-valgrind (disable)	5m 20s
xmlsoft-head-valgrind	6m 36s
xmlsoft-head (ubuntu)	1m 32s
html5lib-tests	46s
xmlsoft-head (windows)	9m 17s
jruby-head	1m 4s
ruby-head (ubuntu, enable)	44s
xmlsoft-head (macos)	1m 31s
ruby-head (ubuntu, disable)	39s
truffleruby-head (--disable-system-libraries --disable-static)	3m 9s
ruby-head (windows, enable)	4m 18s
truffleruby-head (--disable-system-libraries --enable-static)	3m 27s
ruby-head (windows, disable)	3m 22s
truffleruby-head (--enable-system-libraries)	2m 34s
ruby-head (macos, enable)	30s
ruby-head (macos, disable)	1m 6s
	45m 55s

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