[Distutils] pkg_resources and Mac OS X compatibility

[Bob Ippolito]

With the way that we're returning the distutils platform on the  
universal branch of Mac OS X, we need another patch to  
pkg_resources.  The reason for this is that  
distutils.util.get_platform() returns the platform that it is trying  
to produce binaries for, which is often not the exact current  
platform.  More specifically, our current strategy is to produce a  
version of Python that will build extensions that are compatible with  
Mac OS X 10.3, but the actual building of extensions requires Mac OS  
X 10.4 or later (because the toolchain doesn't exist on Mac OS X 10.3).

In some rare cases, people will want to produce packages that  
explicitly require Mac OS X 10.4 or later, which they can do by  
setting the MACOSX_DEPLOYMENT_TARGET=10.4 environment variable when  
running setup.py.  This will influence the value returned by  
disutils.util.get_platform(), and will influence the compiler and  
linker if extensions are built.

This patch adds an internal _get_max_platform(plat) function that  
returns the actual runtime version of Mac OS X, for use in  
compatible_platforms.

-bob

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