Defines starting with `d' in heretic

• DEMOMARKER src/g_game.c:1634
• DETAILHI src/dstrings.bak:31
• DETAILLO src/dstrings.bak:32
• DEVTYPE_CYBERMAN src/i_cyber.c:92
• DISTMAP src/r_main.c:505
• DOOMCOM_ID src/doomdef.h:590
• __DOOMDATA__ src/doomdata.h:7
• __DOOMDEF__ src/doomdef.h:5
• DOSMEMSIZE src/i_cyber.c:56
• DOSY src/dstrings.bak:30
• DPMI_INT src/i_cyber.c:53