[PATCH] Silence execvp argv warning in gcc.c on MinGW

[Aaron W. LaFramboise]

Aaron W. LaFramboise wrote:
> Richard Guenther wrote:
>> On Sun, Aug 17, 2008 at 8:01 AM, Aaron W. LaFramboise
>> <aaronavay62@aaronwl.com> wrote:
> 
>>> Annoyingly, Microsoft's prototype for execvp() differs from POSIX; the
>>> mingw-runtime headers are also different in this same way.

OK, I messed this up a second time.  The attached patch is the one that 
actually works to silence this warning.

Is this OK to commit?

I'd be open to any alternatives if this uglification is not OK.  I'm 
honestly not sure why there's an execvp() call in gcc.c at all, rather 
than using libiberty pexecute.
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