[PATCH] Remove STARTFILE_PREFIX_SPEC spec

[Andrew Pinski <pinskia at physics dot uc dot edu>]

STARTFILE_PREFIX_SPEC was added to fix-up the problems with multi-libed
targets but turned out there was a better way to fix the problem and was
basically unused within 4 months.
Reference:
<http://gcc.gnu.org/ml/gcc-patches/2002-05/msg01660.html>: The patch 
which
added it

<http://gcc.gnu.org/ml/gcc-patches/2002-09/msg01218.html>: The patch 
which
made it useless.

The last use was removed (which I cannot find the gcc-patches message 
for):
2003-08-23  Richard Sandiford  <rsandifo@redhat.com>
        * config/mips/linux64.h (STARTFILE_PREFIX_SPEC): Remove.

This patch removes STARTFILE_PREFIX_SPEC and I will close PR 19353 as
willnotfix.  OK? Bootstrapped and tested on powerpc-darwin.

Thanks,
Andrew Pinski

ChangeLog:

	* gcc.c:  Remove STARTFILE_PREFIX_SPEC support.
	(STARTFILE_PREFIX_SPEC): Remove.
	(startfile_prefix_spec): Remove.
	(static_specs): Remove startfile_prefix_spec.
	(main): Remove support for non-empty startfile_prefix_spec.
	* system.h: Posion STARTFILE_PREFIX_SPEC.

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