r21783: Add in the "create info" field to the reply

r21783: Add in the "create info" field to the reply
from POSIX_OPEN and POSIX_MKDIR as specified
by Stevef in the wikki (extra 4 byte field).

Also fix horrible bug in James's code (James
you should review this for your Apple patch
tree) where he failed to allocate the correct
return memory size when returning a INFO2
struct. Added #define for the size of the
INFO2 struct and made sure we allocate the
correct size for return.

Jeremy.
(This used to be commit d88bc59cb4d5e8851b0856c67ed878ba8bd84552)