Don't complain about deprecated environment variables, like MUSIC_CD, being present in the environment if the user has CDROM defined, or has specified a device on the command line.
Don't complain about deprecated environment variables, like MUSIC_CD,
being present in the environment if the user has CDROM defined, or
has specified a device on the command line.

This avoids users of ports like 'workman' that use these variables
getting gratuitous warnings from cdcontrol.

Suggested by:	John Sellens <jsellens@generalconcepts.com>

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