mesa/st: translate SO info in glsl_to_nir() case

mesa/st: translate SO info in glsl_to_nir() case

This was handled for VS, but not for GS.

Fixes for gallium drivers using nir:
spec@arb_gpu_shader5@arb_gpu_shader5-xfb-streams-without-invocations
spec@arb_gpu_shader5@arb_gpu_shader5-xfb-streams*
spec@arb_transform_feedback3@arb_transform_feedback3-ext_interleaved_two_bufs_gs*
spec@ext_transform_feedback@geometry-shaders-basic
spec@ext_transform_feedback@* use_gs
spec@glsl-1.50@execution@geometry@primitive-id*
spec@glsl-1.50@execution@geometry@tri-strip-ordering-with-prim-restart gl_triangle_strip *
spec@glsl-1.50@transform-feedback-builtins
spec@glsl-1.50@transform-feedback-type-and-size

v2: don't call st_translate_program_stream_output) for TCS

v3: drop scanning patch outputs as TCS can't output xfb

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Tested-by: Karol Herbst <kherbst@redhat.com>