glsl/tests: Verify geometry shader built-ins generated by _mesa_glsl_initialize_variables

Checks that the variables generated meet certain criteria.

 - Geometry shader inputs have an explicit location.

 - Geometry shader outputs have an explicit location.

 - Fragment shader-only varying locations are not used.

 - Geometry shader uniforms and system values don't have an explicit
   location.

 - Geometry shader constants don't have an explicit location and are
   read-only.

 - No other kinds of geometry variables exist.

It does not verify that an specific variables exist.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Paul Berry <[email protected]>

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