bug#72917: ffmpeg@{3,4,5} build failures on i686-linux

[Dariqq]

Hi,

Upgraded my old i686 machine to after core updates merge 
(b8327cb31199fb9f4ebed6c53a59601d41def5a1) and now earlier versions of 
ffmpeg fail to build.


phase `patch-source-shebangs' succeeded after 0.6 seconds
starting phase `bypass-openal-check'
phase `bypass-openal-check' succeeded after 0.0 seconds
starting phase `configure'
ERROR: openal not found



I can't find the "alGetError ||" string in the configure script which is 
used to bypass the check on ffmepg@6 in the earlier versions (#72838).