Add libStorage to make clean target
This patch adds `make -C libstorage clean` to the clean target so that
vendored libstorage artifacts are cleaned by default.
@@ -869,6 +869,10 @@ else
build-libstorage: $(LIBSTORAGE_API)
endif
+clean-libstorage:
+ $(MAKE) -C $(LIBSTORAGE_DIR) clean
+GO_CLEAN += clean-libstorage
+GO_PHONY += clean-libstorage
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