[ECOS] MIPS variant specific stuff in arch.inc?

[Andy Dyer]

Is there a reason why there's so much variant specific stuff
in the hal/mips/arch/current/include/arch.inc?  There are a
bunch of #ifdef CYG_HAL_MIPS_R3900 and one or two #ifdef CYG_HAL_MIPS32
statements in there.

I don't have any systems with those cpus, so if I made a patch
I have no way to test it.

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