[cc65] Need to pass drive number in addition to device number to cbm_opendir

Since cbm_opendir doesn't take a string for the directory command
(something which should also be considered), we need a method to open a
directory on a specific drive.

-- 
Payton Byrd
<http://www.paytonbyrd.com>
<http://it.toolbox.com/blogs/paytonbyrd>

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