Add all of contrib/ to dist, not just loaders

Change-Id: I467e21de6805ea9f23ae483317d602e9d81e1148
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/1909


Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

Makefile.am

@@ -31,7 +31,7 @@ EXTRA_DIST = \
 	tools/logger.pl \
 	tools/rlink_make_speed_table \
 	tools/st7_dtc_as \
-	contrib/loaders
+	contrib/
 
 libtool: $(LIBTOOL_DEPS)
 	$(SHELL) ./config.status --recheck