[patch] Remove the Darwin_Generic_GCC toolchain

[Rafael Espíndola]

This is currently unused by any test. The code path would still be hit
by clang on ppc, but

* PPC has not been supported on current versions of OS X
* A port of current clang to older OS X on ppc should be using
toolchains::DarwinClang.

Cheers,
Rafael
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