Include qa/patch in Makefile

Fix the build by including the qa/patch directory in Makefile.am.
Signed-off-by: Thomas Thrainer <thomasth@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>

Makefile.am

@@ -121,6 +121,7 @@ DIRS = \
 	lib/watcher \
 	man \
 	qa \
+	qa/patch \
 	test \
 	test/data \
 	test/data/bdev-rbd \