Display gold symbol as Unicode if so configured

Some Unicode bits from winmap.c are moved to winX.c, so that winstat.c
can also use them.

include/winX.h

@@ -513,5 +513,9 @@ extern void genl_outrip(winid, int, time_t);
 extern void X11_preference_update(const char *);
 extern void X11_update_inventory(int);
 extern win_request_info *X11_ctrl_nhwindow(winid, int, win_request_info *);
+extern X11_map_symbol X11_glyph_char(const glyph_info *);
+#ifdef ENHANCED_SYMBOLS
+extern XFontStruct *X11_unicode_font(Display *, XFontStruct *);
+#endif
 
 #endif /* WINX_H */