Allow using device numbers on Windows.
Fail if device number can not be resolved to a device.

Signed-off-by: Philipp Wolfer <ph.wolfer@gmail.com>
Print the device name in error messages on Windows.

Use a similar error message as on Unix.
Changed error message when a drive number cannot be found on Windows.
win32: Do not change default_device when calling mb_disc_read_unportable
win32: Fixed get drive by drive number.
Merge branch 'win_allow_drive_numbers'

see pull request #42 and LIB-55

Conflicts:
	src/disc_win32.c