Update config.gcc for sparc-elf target use of sol2 headers/files

[Mark Mitchell]

Daniel Jacobowitz wrote:

>>I'm not really sure what to do for 4.0.x: maybe duplicate sparc/sol2.h 
>>entirely for the embedded targets and remove the offending bits there.
> 
> 
> That sounds like a good approach.

To me too.

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Mark Mitchell
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