build: auto remove build dirs

scripts/autoremove

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2019-present Team LibreELEC (https://libreelec.tv)
+
+. config/options "${1}"
+
+if [ -d "${PKG_BUILD}" -a "${PKG_SECTION}" != "virtual" ]; then
+  print_color CLR_AUTOREMOVE "AUTOREMOVE ${PKG_BUILD}"
+  echo
+  rm -r "${PKG_BUILD}"
+fi