Run installcheck in gpcontrib instead of gpAux/extensions

Co-authored-by: NJimmy Yih <jyih@pivotal.io>

GNUmakefile.in

@@ -150,8 +150,7 @@ $(call recurse,installcheck-world, \
 			   contrib/indexscan \
 			   contrib/hstore \
 			   contrib/pgcrypto \
-			   gpcontrib/gp_internal_tools \
-			   gpAux/extensions \
+			   gpcontrib \
 			   src/bin/gpfdist \
 			   src/interfaces/gppc \
 			   src/test/kerberos \

gpcontrib/Makefile

@@ -80,6 +80,7 @@ distclean:
 	if [ "$(enable_gphdfs)" = "yes" ]; then $(MAKE) -C gphdfs distclean; fi
 
 installcheck:
+	$(MAKE) -C gp_internal_tools installcheck
 	if [ "$(enable_mapreduce)" = "yes" ]; then \
 		$(MAKE) -C gpmapreduce installcheck; \
 	fi