[Revised patch] Rework MIPS command-line handling

[Eric Christopher]

> OK, maybe I missed your point then ;).  Sounds like you're saying we
> should drop MEABI support for gcc when TARGET_GAS.  Is that right?
> If so, what do you think we should do with the mipsisa*-elf configs?

Hrm. Given that MIPS doesn't seem to want to release their spec for
MEABI anyhow perhaps we should. It seems dead as far as I can tell.

Let's just leave it alone for right now and revisit it later.

-eric

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