ubus: fix ubus lua binding duplication

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 37074

package/system/ubus/Makefile

@@ -69,7 +69,7 @@ endef
 
 define Package/libubus/install
 	$(INSTALL_DIR) $(1)/lib
-	$(CP) $(PKG_INSTALL_DIR)/usr/lib/* $(1)/lib/
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/*.so $(1)/lib/
 endef
 
 define Package/libubus-lua/install