Hide greenplum functions that don't need to be exposed.

contrib/pg_upgrade/greenplum/option_gp.c

 #include "postgres_fe.h"
 #include "pg_upgrade_greenplum.h"
-#include "greenplum_cluster_info.h"
+#include "tablespace_gp_internal.h"
 #include "greenplum_cluster_info_internal.h"
 
 typedef enum

contrib/pg_upgrade/greenplum/pg_upgrade_greenplum.h

@@ -117,7 +117,7 @@ pg_attribute_printf(3, 4);
 void close_progress(void);
 
 /* tablespace_gp.c */
-void populate_old_cluster_with_old_tablespaces(ClusterInfo *oldCluster, const char *file_path);
+
 void generate_old_tablespaces_file(ClusterInfo *oldCluster);
 void populate_gpdb6_cluster_tablespace_suffix(ClusterInfo *cluster);
 bool is_gpdb_version_with_filespaces(ClusterInfo *cluster);

contrib/pg_upgrade/greenplum/tablespace_gp.c

@@ -10,6 +10,7 @@
  */
 #include "pg_upgrade_greenplum.h"
 #include "old_tablespace_file_gp.h"
+#include "tablespace_gp_internal.h"
 #include "greenplum_cluster_info_internal.h"
 
 static char *

contrib/pg_upgrade/greenplum/tablespace_gp_internal.h

+void populate_old_cluster_with_old_tablespaces(ClusterInfo *oldCluster, const char *file_path);