Since "srcdir" should now be defined on all platforms, use it to
find the module source.

directory other than the source directory, simplify the test code in
test_sysconfig.py.

the source.  Also, define 'srcdir' on non-posix platforms.

Reviewed by Amaury Forgeot d'Arc.

universal builds that are presented by the configure script.

Reviewed by Benjamin Peterson.

later test failures.  As discussed on #python-dev

non-ascii characters and Unicode in setup.py meta-data.

from the same python instance, some environment variables (LIB, INCLUDE)
would grow without limit.

Tested with these statements:
    distutils.ccompiler.new_compiler().initialize()
    print os.environ['LIB']
But I don't know how to turn them into reliable unit tests.

Be less strict when parsing these version numbers,
they don't necessarily follow the python numbering scheme.