vrend: Fixup typo in SHADER_REQ_GPU_SHADER5 logic

In 0ea74890db, I had a typo that
made GL_ARB_gpu_shader5 being injected into vertex-shaders that
doesn't need them.

This is obviously a big problem when running on for instance GLES
2.0, where this extension isn't supported. So let's fix this.

Tested-by: Jakob Bornecrantz <jakob@collabora.com>
Reviewed-by: Jakob Bornecrantz <jakob@collabora.com>
Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Signed-off-by: Jakob Bornecrantz <jakob@collabora.com>

src/vrend_shader.c

@@ -558,7 +558,7 @@ iter_declaration(struct tgsi_iterate_context *iter,
       ctx->inputs[i].glsl_gl_block = false;
 
       if (iter->processor.Processor == TGSI_PROCESSOR_FRAGMENT &&
-          decl->Interp.Interpolate == TGSI_INTERPOLATE_LOC_SAMPLE) {
+          decl->Interp.Location == TGSI_INTERPOLATE_LOC_SAMPLE) {
          ctx->shader_req_bits |= SHADER_REQ_GPU_SHADER5;
          ctx->has_sample_input = true;
       }