Variables starting with `g' in djgppdoom

• gameaction src/d_event.h:115
• gamekeydown src/g_game.c:184
• gametime src/d_net.c:367
• GAMMALVL4 src/m_menu.c:117
• GCC src/readme.asm:6
• gray src/r_draw.c:456
• grid src/am_map.c:219
• GS_DEMOSCREEN src/d_main.c:189