Variables starting with `g' in src/od-amiga

• get_color_failed src/od-amiga/ami-win.c:249
• GfxBase src/od-amiga/ami-win.c:223
• GUI src/od-amiga/UAEWB:164
• gui_rexx src/od-amiga/ami-rexx.c:103
• GUI_REXX_MAX src/od-amiga/ami-rexx.c:83