fix make distclean, when no .config exit

mk/build.mk

@@ -389,10 +389,10 @@ _mconfig2: ${CONFIG}/conf modconfig .menu
 
 distclean:
 	@$(MAKE) -C $(CONFIG) clean
-	@rm -rf $(BUILD_DIR) $(TOOLS_BUILD_DIR) $(BIN_DIR) $(DISTDIR) \
-	    ${TOPDIR}/.cfg* ${TOPDIR}/package/pkglist.d
-	@rm -rf $(TOOLCHAIN_BUILD_DIR) $(STAGING_PARENT) $(TARGET_DIR)
-	@rm -f .config* .defconfig all.config .tmpconfig.h ${TOPDIR}/prereq.mk \
+	@rm -rf $(BUILD_DIR_PFX) $(BIN_DIR_PFX) $(TARGET_DIR_PFX) $(DISTDIR) \
+	    ${TOPDIR}/.cfg* ${TOPDIR}/package/pkglist.d $(TOPDIR)/bulkdir
+	@rm -rf $(TOOLCHAIN_BUILD_DIR_PFX) $(STAGING_PARENT_PFX) $(TOOLS_BUILD_DIR)
+	@rm -f .config* .defconfig .tmpconfig.h all.config ${TOPDIR}/prereq.mk \
 	    .menu ${TOPDIR}/package/*/info.mk ${TOPDIR}/package/Depends.mk
 
 endif # ! ifeq ($(strip $(ADK_HAVE_DOT_CONFIG)),y)