Upload of mp3 files fail on debian stretch 9

I have reproduced this issue but I’m not sure what the origin of it is. The only solution I’m aware of at the moment is to install liquidsoap 1.3 from opam see https://github.com/LibreTime/libretime/issues/192 for installation instructions.

The issue at this point is that some debian installs work and some don’t. If we can determine the difference we maybe able to fix this issue without resorting to modifying the install script to install liquidsoap via opam.