[gomp4] Accelerator configury and paths changes 1/3

[Bernd Schmidt]

This adds the --enable-accelerator option.  This isn't too useful yet as 
there's no nvptx target so far, but it's part of the other changes to 
the configury that allows for offloading/accelerator targets.

Committed on gomp-4_0-branch.


Bernd
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