build: only consider directories containing a Makefile, fixes compilation crashes if a file or empty directory exists in modules/, applications/ etc.
build: only consider directories containing a Makefile, fixes compilation crashes if a file or empty directory exists in modules/, applications/ etc.


git-svn-id: f7818b41aa164576329f806d7c3827e8a55298bb@8148 ab181a69-ba2e-0410-a84d-ff88ab4c47bc

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