upstream #976

Job	Run time
xmlsoft-head (ubuntu)	3m 55s
ruby-head (ubuntu, enable)	50s
xmlsoft-head (windows)	11m 7s
jruby-head	1m 16s
ruby-head (ubuntu, disable)	2m 57s
html5lib-tests	1m 8s
xmlsoft-head (macos)	3m 34s
ruby-head (windows, enable)	3m 40s
ruby-head-valgrind (enable)	5m 4s
ruby-head (windows, disable)	5m 46s
xmlsoft-head-valgrind	6m 26s
truffleruby-head (--disable-system-libraries --disable-static)	5m 26s
ruby-head-valgrind (disable)	7m 5s
ruby-head (macos, enable)	2m 41s
truffleruby-head (--disable-system-libraries --enable-static)	3m 10s
ruby-head (macos, disable)	34s
truffleruby-head (--enable-system-libraries)	2m 14s
	1h 6m 53s

Provide feedback