Add multilib config for powerpc-xilinx-eabi

[Michael Eager]

Add multilib configuration for powerpc-xilinx-eabi.
Tested with --target=powerpc-eabisim.


2009-04-22  Michael Eager <eager@eagercon.com>

         * config/rs6000/t-xilinx: New, multilib for Xilinx PPC with
         single/double precision FPU.
         * config.gcc: Replace t-ppcgas & t-ppccomm with t-xilinx for
         powerpc-xilinx-eabi.

-- 
Michael Eager	 eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077
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