The FFmpeg building flow has become too different on linux and macos.
Decoupling the logic makes it more simple to follow.
The CR also fixes nits and shellcheck warnings in install-ffmpeg.
Pick-to: 6.8 6.9
Change-Id: I28639d28c7210809e52ff18ce612da52f8754285
Reviewed-by: Jøger Hansegård <joger.hansegard@qt.io>
This patch modifies linux/ffmpeg-install.sh to work also for macOS.
The FFmpeg libraries are installed under /usr/local both for Linux
and macOS.
Since macOS x64 does not have the lzma lib for arm64 architecture
installed by default, I disable this libraries for FFmpeg. This
only affects the TIFF image decoder that we do not use.
Added the execute permission to the ubuntu scripts.
Change-Id: Ib8623c6a9bcdd24c89045ede0494839fb9cd2ecc
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>