WHEEL metadata uses CRLF line endings Windows

[sputt]

Building universal wheels should produce identical wheels on all platforms We need to use LF only line endings on Windows.

In bdist_wheel.py

        wheelfile_path = os.path.join(wheelfile_base, 'WHEEL')
        logger.info('creating %s', wheelfile_path)
        with open(wheelfile_path, 'w') as f:
            Generator(f, maxheaderlen=0).flatten(msg)

Proposed Fix

This should use a BytesGenerator on Python 3 and a Generator on Python 2. The open should occur with 'wb' on Python 3 and optionally 'wbN' on Python 2.