Improve and test distclean implementation

The implementation as-is as various smaller/esoteric bugs and
inconsistencies like apt-get not supporting them, the option -s
being supported in code but not accepted on the command line,
the regex not escaping the dot before the file extension and
exposing more implementation details to public headers than we
actually need.

Also comes with a small test case to ensure it actually works.

References: bd7c126e3fb1b94e76e0e632c657cea854586844

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