Defines starting with `d' in 321/qcommon

• DTRIVERTX_LNI 321/qcommon/qfiles.h:116
• DTRIVERTX_SIZE 321/qcommon/qfiles.h:117
• DTRIVERTX_V0 321/qcommon/qfiles.h:113
• DTRIVERTX_V1 321/qcommon/qfiles.h:114
• DTRIVERTX_V2 321/qcommon/qfiles.h:115