[CMake] FindPythonLibs on macOS

[Jonas Devlieghere]

Hi everyone,

I'm having trouble with FindPythonLibs on macOS when having a version of Python installed from either via python.org <http://python.org/> or Homebrew (in addition to the system one). 

The issue is that I end up with an inconsistency between the library and the interpreter, which causes issues at runtime. 

-- Found PythonLibs: /usr/lib/libpython2.7.dylib (found version "2.7.10")		<- System Python
-- Found PythonInterp: /usr/local/bin/python2.7 (found version "2.7.15")        <- Homebrew Python 

I was wondering if there's a particular reason that FindPythonLibs doesn't use the python-config binary to find both the python libraries and interpreter. 

Cheers,
Jonas
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