Get include directories of Visual C++.

def get_inc(self):
        """
        Get include directories of Visual C++.
        """
        dirs = []
        for part in ['', 'atlmfc']:
            include = os.path.join(self.vc_dir, part, 'include')
            if os.path.isdir(include):
                logging.info(_('using include: %s'), include)
                dirs.append(include)
            else:
                logging.debug(_('include not found: %s'), include)
        return dirs