[PATCH] SYSROOT subdir support

[<gp at qnx dot com>]

Hi.

Here is the new SYSROOT subdir patch.  This results from a discussion
with Daniel Jacobowitz and Alexandre Oliva on the gcc mailing list,
starting at:

   http://gcc.gnu.org/ml/gcc/2003-03/msg00329.html

QNX Neutrino has a target system root that targets all CPU variants
of a given version of our OS at the same time, with a single common
set of system header files, and cpu specific files in subdirs.  I explain
it a bit more in the following message:

   http://gcc.gnu.org/ml/gcc/2003-03/msg00437.html

I only need the SYSROOT_SUBDIR_SPEC, but I was asked to implement both
a subdir for binaries (SYSROOT_SUBDIR_SPEC) and a subdir for headers
(SYSROOT_HEADERS_SUBDIR_SPEC).

LMK, and thanks.
GP

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