Fix compilation error > libao --disable-pulse 

Disabled pulse as it causes a compilation error looking for the headers.
Probably related to adding the packages needed to compile the 'texturepacker'.
Since the pulse plugin isn't required in the build it made sense to take this action as others trying to build may come across this issue too.
Seems weird though because I could build from the quarnster git just fine. Anyhow, removing shouldn't cause any issues.