on AIX 5.2"
Added dummy definition of MAP_NORESERVE for systems which doesn't provide it,
removed duplicates
my_sys.h:
added definition for MAP_NORESERVE
(for Irix and AIX systems)
sql_map.cc:
removed definition of MAP_NORESERVE
mi_packrec.c:
removed definition of MAP_NORESERVE and MMAP_PRIVATE