* ldm88k.sc: "Clean up" script, so that ldm88kUr.sc and ldm88kr.sc
can be automatically generated.
* ldemul.c, configure.in, config.h, Makefile.in:
Add support for Sony NewsOS3.
* Makefile.in: Re-do the way ldemulation scipts and structures
are done. do we only need one or two files for each emulation
target (a TARGET.sc and optionally TARGET.c, if ldtemplate
isn't suitable). This gets rid of lots of extra source files.