Macros starting with `p' in bsd/sys

• pack bsd/sys/trace.h:136
• pcred_readlock bsd/sys/proc.h:299
• pcred_unlock bsd/sys/proc.h:303
• pcred_writelock bsd/sys/proc.h:301
• PGRPHASH bsd/sys/proc.h:322
• PIDHASH bsd/sys/proc.h:318
• powerof2 bsd/sys/param.h:211
• PRC_IS_REDIRECT bsd/sys/protosw.h:200
• __PROJECT_VERSION bsd/sys/cdefs.h:165