Variables starting with `r' in djgppdoom

• record src/r_defs.h:97
• redundant src/i_viorig:590
• refresh src/changelog:97
• release src/readme.book:4
• reloadlump src/w_wad.c:137
• reloadname src/w_wad.c:138
• rendered src/m_menu.c:1738
• restricted src/doomlic.txt:13
• Retrieval src/r_data.c:671
• right src/am_map.c:159
• rndindex src/m_random.c:54
• rotation src/r_defs.h:415