* cygpath.cc (RtlEqualUnicodePathPrefix): New helper function.

	* cygpath.cc (RtlEqualUnicodePathPrefix): New helper function.
	(HARDDISK_PREFIX): Move.
	(GLOBALROOT_PREFIX): Define.
	(get_device_name): Take GLOBALROOT_PREFIX into account.
	Improve check for path to allow filesystem access via block devices.
	Potentially drop \\.\ prefix if resulting path is a valid DOS
	pathname.
	(do_pathconv): Make sure to drop \\?\ prefix only if path is
	actually a filesystem based path.
	(print_version): Fix copyright.