zink: stop zink_set_primitive_emulation_keys producing geometry shaders on platforms that do not support them.

If line smooth, stipple, quad_prims and a collection of other things are needed, zink produces a geometry shader to create them.

This code is disabling that from happening when there is no geometry shader support.
This removes a constant barrage of validation issues when trying to draw basic triangles.
Some of this missing functionality will be added back in later.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33059>

src/gallium/drivers/zink/zink_program.c

@@ -2501,6 +2501,9 @@ void
 zink_set_primitive_emulation_keys(struct zink_context *ctx)
 {
    struct zink_screen *screen = zink_screen(ctx->base.screen);
+   if (!screen->info.feats.features.geometryShader)
+      return;
+
    bool lower_line_stipple = false, lower_line_smooth = false;
    unsigned lower_pv_mode = 0;
    if (!screen->optimal_keys) {