On RHEL8, openssl1.x.x is default, and openssl3 pc files
are with the suffix "3", so FFmpeg cannot find them.
The patch fixes pc files so that ffmpeg can find them.
Task-number: QTBUG-130257
Change-Id: I5a95daae0a78aadede109535b2823483bfcbc09d
Pick-to: 6.8
Reviewed-by: Tim Blechmann <tim.blechmann@qt.io>
Reviewed-by: Pavel Dubsky <pavel.dubsky@qt.io>
Reviewed-by: Jøger Hansegård <joger.hansegard@qt.io>
6cd74e132a