Work around the AIX 5.1 ML7 patch problem in errno at a higher level, in srv0start.c
os0file.c:
  Revert the AIX patch here


innobase/os/os0file.c:
  Revert the AIX patch here
innobase/srv/srv0start.c:
  Work around the AIX 5.1 ML7 patch problem in errno at a higher level, in srv0start.c