main: Fix MaxUniformComponents for geometry shaders.
main: Fix MaxUniformComponents for geometry shaders.

For both vertex and fragment shaders we default MaxUniformComponents
to 4 * MAX_UNIFORMS.  It makes sense to do this for geometry shaders
too; if back-ends have different limits they can override them as
necessary.

Fixes piglit test:
spec/glsl-1.50/built-in constants/gl_MaxGeometryUniformComponents

Cc: "10.0" <mesa-stable@lists.freedesktop.org>

Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

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