glsl: Remove do_set_program_inouts.

No longer used since 214c774ba6 ("mesa/st: Remove st_glsl_to_tgsi.").

Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18466>

src/compiler/glsl/ir.h

@@ -2513,10 +2513,6 @@ _mesa_glsl_initialize_variables(exec_list *instructions,
 extern void
 reparent_ir(exec_list *list, void *mem_ctx);
 
-extern void
-do_set_program_inouts(exec_list *instructions, struct gl_program *prog,
-                      gl_shader_stage shader_stage);
-
 extern char *
 prototype_string(const glsl_type *return_type, const char *name,
 		 exec_list *parameters);