Bug#1075976: Minor mitigation

[Daniel Martin <martin@snowplow.org>]

First, the mitigation: adding this into /etc/default/fluidsynth mostly 
mitigates this issue, but does not resolve it:

     OTHER_OPTS='-z8192'

Upstream this bug exists as
https://github.com/FluidSynth/fluidsynth/issues/338
and the upstream author seems almost hostile to the idea that anyone 
would not want fluidsynth to suck up CPU in the background.

It's a strong enough attitude that I'm tempted to conclude that 
fluidsynth is not yet ready to be a dependency of any widely used 
package (like timidity)