swr: Don't report support for shader images.

gallivm has images support, but this driver doesn't.

Cc: mesa-stable (for the upcoming shader image leak fix)
Acked-by: Jan Zielinski <jan.zielinski@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8530>

src/gallium/drivers/swr/swr_screen.cpp

@@ -349,8 +349,10 @@ swr_get_shader_param(struct pipe_screen *screen,
        shader != PIPE_SHADER_TESS_EVAL)
       return 0;
 
-   if (param == PIPE_SHADER_CAP_MAX_SHADER_BUFFERS)
+   if (param == PIPE_SHADER_CAP_MAX_SHADER_BUFFERS ||
+       param == PIPE_SHADER_CAP_MAX_SHADER_IMAGES) {
       return 0;
+   }
 
    return gallivm_get_shader_param(param);
 }