* Makefile.in: Major changes. Removed some the sed

	* Makefile.in:  Major changes.  Removed some the sed
	magic to converts scripts, since that is now handled
	by genscripts.sh and the *.sc-sh scipt generators.
	* config.h:  Remove a bunch of macros defining emulations
	and targets.  This becomes one less file to edit when
	adding emulations or targets.
	* ldemul.h (struct ld_emulation_xfer_struct):  Add
	emulation_name and target_name fields.
	* ldemul.c, ldemul.h:  Define some default functions used
	by most emulations (and remove from the *.em scripts).
	* ldemul.c (ldemul_choose_target):  Search the new
	ld_emulations array using a loop (instead of a hardwired
	nested if statement).
	Define the ld_emulation from the automatically-geenrated
	ldemul-list.h.  This means you no longer have to edit ldemul.c
	to add a new emulation.
	* ldmain.c:  Replace {GLD,LNK}960_EMULATION_NAME by
	their expansions, since the former no longer exist.
	* PORTING:  A very rough first draft of a porting guide.