Remove strip_underscore from struct emulation

This field is unused.  I would have liked to also remove
leading_underscore and fake_label_name but in an i386-elf/coff/aout
multi-obj setup those fields are used to select a different
fake_label_name for aout.

	* emul.h (struct emulation): Delete strip_underscore.
	* emul-target.h (emul_strip_underscore): Don't define.
	(emul_struct_name): Update initialization.
3 files changed