mesa: bump MAX_VARYING to 32
We're starting to get apps utilizing more than 16 varyings and
most current hardware supports 32 anyway.
Tested with r600g.
swrast, softpipe and llvmpipe still advertise 16 varyings.
This fixes a WebGL crash after launching this demo:
https://developer.mozilla.org/en-US/demos/detail/falling-cubes
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54402
NOTE: This is a candidate for the stable branches.
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit
b3921e1f53833420e0a0fd581f741744e7957a05)
Conflicts:
src/mesa/main/context.c