[Libcdio-devel] Do not list slice devices on OS X

[Robert Kausch]

Hi,

The attached patch adds kIOMediaWholeKey to the filter list for 
IOServiceGetMatchingServices in osx.c.

Without it, IOServiceGetMatchingServices returns one device for the 
whole disc (e.g. /dev/rdisk0) and an additional "slice" device for each 
track (e.g. /dev/rdisk0s0, /dev/rdisk0s1 and so on). The patch makes it 
return only the whole disc device.

This fixes cdio_get_devices returning invalid devices on OS X.

Best regards,
Robert