Makefile: consolidate hardcoded lists of files to clean
Currently, we have two places where we list files that should always be cleaned if they exist. One, the CLEAN_FILES variable, is from the Linux build system and is the proper place to list files. The other, a set of extra arguments passed in the xargs template used to remove files with certain extensions, was introduced by 8f06f0ce ("Makefile: clean image.map") and is clearly wrong: by extending the xargs template, we attempt to remove the files once for each batch of arguments that xargs produces and we reduce the number of files from stdin that xargs can include in each of its rm commands. To fix this, put all hardcoded files into CLEAN_FILES. Signed-off-by: NThomas Hebb <tommyhebb@gmail.com>
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