install-ffmpeg-linux.sh: Add named parameters


This patch adds named parameters to install-ffmpeg-linux.sh. Making it
easier to run locally.

Pick-to: 6.12
Change-Id: Iba5477b5e0544cbdcb94db8e26f0802b82aa683a
Reviewed-by: Elias Toivola <elias.toivola@qt.io>
commit7b9d51b198fd79b7de7e7419a13774d3903fc117
parentaed2187cbd1bca9d52cdb37e84c147f8f0995c69
authorNils Petter Skålerud <nils.petter.skalerud@qt.io>
committerNils Petter Skålerud <nils.petter.skalerud@qt.io>
commit timeMon, 26 Oct 2026 19:58:58 +0000