* config/m68k/tm-m68k.h: Renamed from config/m68k/tm-68k.h.

	* config/m68k/tm-m68k.h:  Renamed from config/m68k/tm-68k.h.
	* m68k/{tm-3b1.h, tm-altos.h, tm-amix.h, tm-es1800.h,
	tm-hp300bsd.h, tm-hp300hpux.h, tm-isi.h, tm-news.h, tm-os68k.h,
	tm-st2000.h, tm-sun2.h, tm-sun3.h, tm-vx68.h}:  Include tm-m68k.h
	instead of tm-68k.h.
	* Makefile.in (HFILES):  tm-68k.h renamed to tm-m68k.h.
	* README, a29k-pinsn.c, m68k-pinsn.c, m68k-stub.c, remote-vx.c,
	m68k/{altos.mh, altos.mt, apollo68b.mh, nm-apollo68b.h,
	nm-hp300bsd.h, config/m68k/xm-apollo68b.h}:  Map '68k' to 'm68k'.
	* a29k/tm-a29k.h, doc/gdbint.texinfo:  Account for renaming of
	tm-68k.h to tm-m68k.h.
	* m68k/m68k-fp.mt (TM_FILE):  tm-68k-fp.h renamed to tm-m68k-fp.h.
	* m68k/m68k-nofp.mt (TM_FILE):  tm-68k-nofp.h renamed to
	tm-m68k-nofp.h.