glsl: Generate smaller values for uniform locations

Previously we would generate uniform locations as (slot << 16) +
array_index.  We do this to handle applications that assume the location
of a[2] will be +1 from the location of a[1].  This resulted in every
uniform location being at least 0x10000.  The OpenGL 4.3 spec was
amended to require this behavior, but previous versions did not require
locations of array (or structure) members be sequential.

We've now encountered two applications that assume uniform values will
be "small."  As far as we can tell, these applications store the GLint
returned by glGetUniformLocation in a int16_t or possibly an int8_t.

THIS BEHAVIOR IS NOT GUARANTEED OR IMPLIED BY ANY VERSION OF OpenGL.

Other implementations happen to have both these behaviors (sequential
array elements and small values) since OpenGL 2.0, so let's just match
their behavior.

Fixes "3D Bowling" on Android.

NOTE: This is a candidate for stable release branches.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-and-tested-by: Chad Versace <[email protected]>

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