Makefile: move the cleaning of staging_dir/target* from dirclean to clean

Currently "make clean" only clears the build_dir/target*, but leaves
staging_dir/target* intact. "make clean" should also clean the
staging_dir/target* directories, as in the current situation some old
packages or libraries may be linked into the firmware from staging_dir
despite a "make clean".

The patch reorganises clean / dirclean functionality so that
* "make clean" also clears the staging_dir/target* in addition to
build_dir/target*.
* "make dirclean" clears toolchain and host(=tools) directories from both
build_dir and staging_dir

signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

SVN-Revision: 45973

Makefile

@@ -50,10 +50,10 @@ printdb:
 prepare: $(target/stamp-compile)
 
 clean: FORCE
-	rm -rf $(BUILD_DIR) $(BIN_DIR) $(BUILD_LOG_DIR)
+	rm -rf $(BUILD_DIR) $(STAGING_DIR) $(BIN_DIR) $(BUILD_LOG_DIR)
 
 dirclean: clean
-	rm -rf $(STAGING_DIR) $(STAGING_DIR_HOST) $(TOOLCHAIN_DIR) $(BUILD_DIR_HOST) $(BUILD_DIR_TOOLCHAIN)
+	rm -rf $(STAGING_DIR_HOST) $(TOOLCHAIN_DIR) $(BUILD_DIR_HOST) $(BUILD_DIR_TOOLCHAIN)
 	rm -rf $(TMP_DIR)
 
 ifndef DUMP_TARGET_DB