[patch] Check for libffi_cv_as_x86_pcrel should not look for just "warning"

[Rafael Avila de Espindola]

The check that sets libffi_cv_as_x86_pcrel currently check for "warning" 
or "illegal". The problem is that when trying to build libffi with LTO 
clang will produce the warning

clang: warning: argument unused during compilation: '-emit-llvm'

The attached patch just uses the $CC error code instead. Is that OK or 
is there some strange assembler out there that rejects the assembly bug 
exists with 0?

Cheers,
Rafael
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