[PATCH] SYSROOT subdir support

[gp@qnx.com]

Here is the updated cvs diff with the changes you suggested.  

Let me know if I may commit.

Thanks.
GP

> Jim Wilson <wilson@tuliptree.org> said:
> > 
> > Your xstrdup calls are missing a space before the open parentheses.
> > 
> > The ChangeLog entry you provided is not in the normal form.  It should
> > mention each function/macro modified or added.  So it should look
> > something like this.
> > 
> > 2003-06-05  Graeme Peterson <gp@qnx.com>
> > 
> > 	* gcc.c (target_sysroot_suffix, target_sysroot_hrds_suffix,
> > 	SYSROOT_SUFFIX_SPEC, SYSROOT_HEADERS_SUFFIX_SPEC,
> > 	sysroot_suffix_spec, sysroot_hdrs_suffix_spec): New.
> > 	(static_specs): Initialize new variables.
> > 	(add_sysrooted_prefix, do_spec_1, main): Use new variables.
> > 	* doc/tm.texi (SYSROOT_SUFFIX_SPEC, SYSROOT_HEADEERS_SUFFIX_SPEC):
> > 	New macros.
> > 

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