From: Zeugswetter Andreas SARZ <Andreas.Zeugswetter@telecom.at>

Only occurrs in
src/include/storage/s_lock.h:#if defined(__AIX)
src/include/utils/dt.h:#if defined(__AIX)
src/include/utils/nabstime.h:#if defined(__AIX)

Simply delete one underscore, only occurs once per file, so no patch.