st/mesa: set MaxUnrollIterations = 255
The default was 32 for the EmitNoLoops=0 case. This allows the oZone3D
soft shadows test to work properly with the vmware driver. Jose reported
that SM3 supports up to 255 loop iterations.
NOTE: This is a candidate for the 8.0 branch.
Reviewed-by:
José Fonseca <jfonseca@vmware.com>
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