* Makefile.in (clean): Move to end of file.
(distclean, maintainer-clean, realclean): Ditto.
(mostlyclean): Move rule to end of file. Use GDB_TEX_TMPS,
GDBINT_TEX_TMPS, STABS_TEX_TMPS.
(gdb.dvi, gdb.pdf): Do not cleanup TeX temp files after texi2dvi.
(gdbint.dvi, gdbint.pdf, stabs.dvi, stabs.pdf): Ditto.