Added the 'customize_compiler()' function, which plugs in the essential information about building Python extensions that we discovered in Python's makefile.  Currently only needed on Unix, so does nothing on other systems.
Added the 'customize_compiler()' function, which plugs in the essential
information about building Python extensions that we discovered in
Python's makefile.  Currently only needed on Unix, so does nothing on
other systems.

pypa/setuptools,pypa/setuptools,pypa/setuptools