* i386ly-nat.c, i386lynx-nat.c, m68kly-nat.c: Remove. Move

	* i386ly-nat.c, i386lynx-nat.c, m68kly-nat.c:  Remove.  Move
	common code into lynx-nat.c.
	* lynx-nat.c:  New module.  Contains portable code for Lynx native
	stuff (mostly ptrace related).
	* config/i386/i386lynx.mh (NATDEPFILES):  i386ly-nat.o -> lynx-nat.o
	* config/m68k/m68klynx.mh (NATDEPFILES):  i386ly-nat.o -> lynx-nat.o

	* config/nm-lynx.h, config/tm-lynx.h:  New files to contain
	non-architecture specific native and target defs.
	* config/i386/nm-i386lynx.h, config/i386/tm-i386lynx.h,
	config/m68k/nm-m68klynx.h, config/m68k/tm-m68klynx.h:  Move all
	(arch) portable stuff into ../{tm nm}-lynx.h.