Remove calls to intern with a static string from code that runs on X

Remove calls to intern with a static string from code that runs on X

* Makefile.in (actual-all): Reword build failure advice.

* src/bytecode.c (exec_byte_code, syms_of_bytecode):
* src/font.c (syms_of_font):
* src/hbfont.c (uni_combining):
* src/xfns.c (Fx_display_backing_store, Fx_display_visual_class)
(x_create_tip_frame, Fx_show_tip, syms_of_xfns):
* src/xfont.c (xfont_supported_scripts, xfont_driver)
(syms_of_xfont):
* src/xsmfns.c (Fhandle_save_session, syms_of_xsmfns): Remove
calls to intern with a static string.