glsl: only update doubles inputs for vertex inputs.
glsl: only update doubles inputs for vertex inputs.

This doesn't apply to other stages. This is only
used in the mesa/st code, which needs further fixes.

Reviewed-by: Timothy Arceri <5dd83789ef3714029244367ba1ca09f1d7627408@collabora.com>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler