Defines starting with `p' in windoom

• PLATSPEED src/p_spec.h:305
• PLATWAIT src/p_spec.h:304
• PT_ADDLINES src/p_local.h:178
• PT_ADDTHINGS src/p_local.h:179
• PT_EARLYOUT src/p_local.h:180
• PU_CACHE src/windoom.c:1326