glsl: Check that interpolation quals only apply to vertex ins and fragment outs

The check is performed only in GLSL versions >= 1.30.

Fixes the following Piglit tests:
* spec/glsl-1.30/compiler/interpolation-qualifiers/fs-smooth-02.frag
* spec/glsl-1.30/compiler/interpolation-qualifiers/vs-smooth-01.vert
1 file changed