glsl/standalone: Optimize dead variable declarations

We didn't bother with this in the regular compiler because it doesn't
change the generated code.  In the stand-alone compiler, this can
clutter the output with useless variables.  It's especially bad after
functions are inlined but the foo_retval declarations remain.

v2: Use set_foreach.  Suggested by Tapani.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>
Reviewed-by: Iago Toral Quiroga <[email protected]>

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