scons does not clean properly some changes
I don't know if this can be fixed - cpplint.py moved from being a built file to being a library. Because it was no longer a built file, scons didn't know it existed, didn't clean it from build/. Even scons -c didn't clean it up.
Maybe hard code a
rm build/*step? Would that be too gross? Anyway, that's why maus_per_commit_gcc was broken. It's fixed now for cpplint at least in the maus_per_commit_gcc build.