darwin cross compiling breakage

[Mike Stump]

The recent changes to support code generation for the current machine  
on x86 has broken darwin's ppc x i386 compiler.  :-(  We go out of  
our way to not define CROSS_COMPILE to get everything to work right,  
but there just isn't anyway to run x86 instructions of the ppc to  
figure out what x86 cpu we're on.  :-)  We could run ppc instructions  
on the x86, but I digress.

So, presently, I'm doing something like the below patch.  Kinda  
gross, but effective.

Ok for mainline, or do people have some other easy way to disentangle  
cross compilations?

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