[Roumen Petrov]
> Modification for test_build_ext.py from above mentioned issue break
> non-posix builds.

Without that change the test fails on Unix platforms when the build is
not done inside the source directory.  I guess the problem must be the
change from (essentially):

def _get_source_filename():
    return os.path.join(sysconfig.project_base, 'Modules', 'xxmodule.c')

to

def _get_source_filename():
    srcdir = sysconfig.get_config_var('srcdir')
    return os.path.join(srcdir, 'Modules', 'xxmodule.c')

On POSIX, project_base is just the directory containing the Python
executable.  I think the right thing to do is to fix the srcdir var on
non-POSIX systems.  I don't have a Windows machine to test on.  Could
someone test the get_python_inc2.patch with the non_posix_srcdir.patch
applied on top of it?