Patch: Fix "make clean" in libjava

[Tom Tromey]

Jeff> I prefer that it work like 'libtool rm' removing all compiled
Jeff> files, but I don't have a strong reason.  The rule as-is is
Jeff> enough to force a complete rebuild.  Tom may have another
Jeff> opinion.

Yeah, libtool rm is preferred.

Mohan, you might as well just take all the .o/.lo files out of
MOSTLYCLEANFILES, since mostlyclean-local will be removing them
anyway.

Change your patch to do these things and it is ok to go in.  Thanks
for doing this.

Tom