[commit] Make add_setshow's print work

[Andrew Cagney]

Hello,

The attached implements the missing printing mechanims needed for i18n 
printing of set|show variables.

The existing code uses:

           /* Print doc minus "show" at start.  */
           print_doc_line (gdb_stdout, c->doc + 5);

           ui_out_text (uiout, " is ");
           ui_out_wrap_hint (uiout, "    ");
           if (quote)
             ui_out_text (uiout, "\"");
           ui_out_field_stream (uiout, "value", stb);
           if (quote)
             ui_out_text (uiout, "\"");
           ui_out_text (uiout, ".\n");
           do_cleanups (old_chain);

(note the "+ 5").  Knowing this I added:

	const char *print

(e.x., "The value of foo is %s.") to the tentative inteface.  There's a 
problem though, the print statement:

	fprintf_unfiltered (print, value);

attracts the wrath of gcc (A -Wformat error).  Consequently, in 
finishing this I've replaced "print" string with a proper function:

	fprint_setshow_ftype *fprint_setshow

(void fprint_setshow (cmd_list_element *, ui_file *, const char *))

For the moment I've implemented only one such function - 
fprint_setshow_complaints.  For the others I've commented things out.

commited,
Andrew
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