glsl: Fix uniform buffer object counting.

We were counting uniforms located in UBOs against the default uniform
block limit, while not doing any counting against the specific combined
limit.

Note that I couldn't quite find justification for the way I did this, but
I think it's the only sensible thing: The spec talks about components, so
each "float" in a std140 block would count as 1 component and a "vec4"
would count as 4, though they occupy the same amount of space.  Since GPU
limits on uniform buffer loads are surely going to be about the size of
the blocks, I just counted them that way.

Fixes link failures in piglit
arb_uniform_buffer_object/maxuniformblocksize when ported to geometry
shaders on Paul's GS branch, since in that case the max block size is
bigger than the default uniform block component limit.

Reviewed-by: Ian Romanick <[email protected]>

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