glsl: call calculate_subroutine_compat() from the nir linker

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

src/compiler/glsl/gl_nir_linker.c

@@ -623,6 +623,7 @@ check_image_resources(struct gl_context *ctx, struct gl_shader_program *prog)
 bool
 gl_nir_link_glsl(struct gl_context *ctx, struct gl_shader_program *prog)
 {
+   link_util_calculate_subroutine_compat(prog);
    link_util_check_uniform_resources(ctx, prog);
    link_util_check_subroutine_resources(prog);
    check_image_resources(ctx, prog);