mesa/st: convert mesh shader to gl stages

Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36976>

src/mesa/state_tracker/st_extensions.c

@@ -100,6 +100,12 @@ static unsigned mesa_to_gl_stages(unsigned stages)
    if (stages & BITFIELD_BIT(MESA_SHADER_COMPUTE))
       ret |= GL_COMPUTE_SHADER_BIT;
 
+   if (stages & BITFIELD_BIT(MESA_SHADER_TASK))
+      ret |= GL_TASK_SHADER_BIT_EXT;
+
+   if (stages & BITFIELD_BIT(MESA_SHADER_MESH))
+      ret |= GL_MESH_SHADER_BIT_EXT;
+
    return ret;
 }