[issue21311] Fix compiler detection when brew's ccache is installed on Mac OS X

[John Szakmeister]

John Szakmeister added the comment:

Thank you Ned!  The issue is that you can create symlinks to ccache to and put them on your path.  Distros do this for you now, but most create symlinks for a bunch of compilers... including ones that may not be installed.  So the presence of the name ('gcc', for instance) doesn't mean that the compiler is actually installed.  It could be a symlink to the ccache binary and running it could fail.  I hope that makes a little more sense.

Thanks again for applying the patch!

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<http://bugs.python.org/issue21311>
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