Need to #ifdef this out to avoid linking against nonexistent quazip on Linux.
Merge pull request #869 from ey6es/master

Need to #ifdef this out to avoid linking against nonexistent quazip on L...
Merge branch 'master' of https://github.com/worklist/hifi into ssao
Optimizations for occlusion blur (the main one being that we only need to
sample the texture four, not sixteen, times if we turn on linear filtering
and sample between the texels).