Add gpos9 expected files to Makefile.am

test/subset/data/Makefile.am

diff --git a/test/subset/data/Makefile.am b/test/subset/data/Makefile.am
index 133971a..3a8d010 100644
--- a/test/subset/data/Makefile.am
+++ b/test/subset/data/Makefile.am
@@ -21,6 +21,7 @@
 	expected/layout.gpos6 \
 	expected/layout.gpos8 \
 	expected/layout.gpos8.amiri \
+	expected/layout.gpos9 \
 	expected/layout.gsub3 \
 	expected/layout.gsub6 \
 	expected/layout.gdef \