Updates for fixing tic4x arch tagging of its object files.

Updates for fixing tic4x arch tagging of its object files.

	* bfd/coffcode.h (coff_set_flags): Added get/set arch hooks.
	* include/coff/tic4x.h (TICOFF_TARGET_MACHINE_GET): Fixed define bug
	* include/coff/ti.h (TICOFF_TARGET_MACHINE_GET): Added macros
	* ld/Makefile.am: Added etic3xcoff.o and etic4xcoff_onchip.o
	* ld/Makefile.in: Regenerate
	* ld/configure.tgt: Added extra target emulations
	* ld/emulparams/tic3xcoff.sh: Remove old settings
	* ld/emulparams/tic4xcoff.sh: Ditto
	* ld/emulparams/tic3xcoff-onchip.sh: Added new
	* ld/scripttempl/tic4xcoff.sc: Revise and combine both c3x and c4x
	* ld/scripttempl/tic3xcoff.sc: Remove