orphaning mame-data-extras

[Julian Sikorski]

Dear all,

please be advised that I am orphaning mame-data-extras. This package has
become too much of a burden to maintain with monthly mame releases one
one hand and various files included in it lagging behind the mame
releases on the other. Not to mention that it was in violation of
code-vs-content guideline.
I will be putting a dead.package in devel branch in about a week from now.

Best regards,
Julian