[patch] remove gcc::Precompile

[Rafael Espíndola]

Clang still has support for running gcc for performing various stages
of a build. Right now it looks like this is used for

* Supporting Fortran in the clang driver
* Running an assembler or linker in systems we don't yet know how to
run them directly.

It looks like the gcc::Precompile is a vestige from the days when we
supported using clang for C and running gcc for c++. The attached
patch removes it (yes, we have no tests for it).

Cheers,
Rafael
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