Latest commit 76c0a67 Aug 25, 2016 @rwmjones rwmjones build: Add common CLEANFILES and DISTCLEANFILES to common-rules.mk.
By adding common CLEANFILES and DISTCLEANFILES variables to
common-rules.mk, we can remove these from most other Makefiles, and
also clean files more consistently.

Note that bin_PROGRAMS are already cleaned by 'make clean', so I
removed cases where these were unnecessarily added to CLEANFILES.