Revert "pyximport: parse distutils config files (except local setup.cfg)"

This reverts commit 813ff05a80cef908704488e660fa07d49feb8a92.

This was an accidentally applied twice.
use all distutils config files

It is very astonishing to a user, that pyximport uses a different
set of config files from the underlying distutils.
fix typos
clean up C comments in CyFunction/Generator utility code files to avoid writing them out
fix test builder instantiation for pyregr tests
discard all 1-line /*comments*/ from utility C code (not just at the beginning of a line)
clean up cimports in libcpp STL declarations
delete outdated comment on differing scope rules in Cython
Merge pull request #228 from tecki/master

Use all distutils config files in pyximport
changelog
clarify that C name specifications are not for everyday use
add "meteor_contest" benchmark as demo of a program that Cython cannot speed up very much as the bulk of the work (set operations) is in CPython's own code
Py3 fixes for benchmark