Fix 'make clean' in lib subdirectory
* lib/Makefile.in (clean): Remove *-t files. (mostlyclean): Remove MOSTLYCLEANFILES that are not *-t files. This removes files like lib/getopt.h that should be removed even if this configuration did not need to build them. (maintainer-clean): Remove TAGS here, not in distclean, to be consistent with ../src/Makefile.in.
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