[mythtv] trivial change to the osx-packager script for 0.24

[Nigel Pearson]

> Nigel, I noticed in r26663 that it is still referencing
> ignyte and mtd.

Thanks for the reminder, Matt.

It has a if ( -e ...) guard on those missing binaries,
so we don't _need_ to change it. I will leave as-is,
just in case I happen to hack the trunk script
to build old plugins for some bizarre reason.

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