ci/llvmpipe: reenable gpu shader5 tests

I hadn't realised these were disabled, llvmpipe now exposes this extension.

One additional failure is fine to get the added testing coverage.

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5973>

.gitlab-ci.yml

@@ -841,7 +841,6 @@ piglit-quick_gl:
     NIR_VALIDATE: 0
     PIGLIT_OPTIONS: >
       --process-isolation false
-      -x arb_gpu_shader5
       -x egl_ext_device_
       -x egl_ext_platform_device
       -x ext_timer_query@time-elapsed

.gitlab-ci/piglit/quick_gl.txt

@@ -492,6 +492,8 @@ spec/arb_geometry_shader4/arb_geometry_shader4-program-parameter-vertices-out ma
 spec/arb_geometry_shader4/arb_geometry_shader4-program-parameter-vertices-out tf 1: skip
 spec/arb_geometry_shader4/arb_geometry_shader4-program-parameter-vertices-out tf max: skip
 spec/arb_geometry_shader4/arb_geometry_shader4-vertices-in: skip
+spec/arb_gpu_shader5/arb_gpu_shader5-xfb-streams-without-invocations: fail
+spec/arb_gpu_shader5/arb_gpu_shader5-xfb-streams-without-invocations spirv: skip
 spec/arb_gpu_shader_fp64/execution/arb_gpu_shader_fp64-dlist-uniforms: skip
 spec/arb_internalformat_query/minmax: skip
 spec/arb_internalformat_query/misc. api error checks: skip
@@ -1670,10 +1672,10 @@ wgl/wgl-sanity: skip
 summary:
        name:  results
        ----  --------
-       pass:    21862
-       fail:      200
+       pass:    23025
+       fail:      201
       crash:        0
-       skip:     1445
+       skip:     1446
     timeout:        0
        warn:        6
  incomplete:        0
@@ -1682,4 +1684,4 @@ summary:
     changes:        0
       fixes:        0
 regressions:        0
-      total:    23531
+      total:    24696