cmake: dice - deploy ffmpeg


On iOS, we need to deploy the ffmpeg libraries to the app bundle
explicitly.

Fixes: QTBUG-144822
Pick-to: 6.12 6.12.0
Change-Id: I3fd1b808fdfae57ebf51f32ba74607f935ca30fa
Reviewed-by: Nils Petter Skålerud <nils.petter.skalerud@qt.io>
commitb096dba77d75bd716f1e91030e6921a43853df63
parent7635d65e6695a490fec6ff6a44de3933a89ba268
authorTim Blechmann <tim.blechmann@qt.io>
committerTim Blechmann <tim.blechmann@qt.io>
commit timeThu, 24 Sep 2026 23:40:56 +0000