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gallivm: Default brilinear filtering to off, fix cube fails

Emma Anholt requested to merge anholt/mesa:lvp-filtering into main 
It's non-conformant for GL and Vulkan, and not expected to be a desired
quality/speed tradeoff for applications using llvmpipe.  The option is
left in place using GALLIVM_PERF=brilinear.

Causes minor rasterization changes in our traces:
- improved sharpness of the trees in CS
- more consistent mipmap filtering of the ground in CS:Source, STK and the
  RaytracedShadows demo.
- changing some aliasing on shadow maps in 0ad (not consistently
  visibly better or worse)
Edited by Emma Anholt

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