postgresql: move systemd service file to /usr/lib

Signed-off-by: Mike Williams <mike@mikebwilliams.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/postgresql/postgresql.mk

@@ -85,9 +85,9 @@ endef
 
 define POSTGRESQL_INSTALL_INIT_SYSTEMD
 	$(INSTALL) -D -m 644 package/postgresql/postgresql.service \
-		$(TARGET_DIR)/etc/systemd/system/postgresql.service
+		$(TARGET_DIR)/usr/lib/systemd/system/postgresql.service
 	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
-	ln -fs ../postgresql.service \
+	ln -fs ../../../../usr/lib/systemd/system/postgresql.service \
 		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/postgresql.service
 endef