Darwin: Assign correct value to myDstaddr in afsi_SetServerIPRank()

Darwin: Assign correct value to myDstaddr in afsi_SetServerIPRank()

The value in sin->sin_addr.s_addr that's assigned to myDstaddr in the
Darwin version of afsi_SetServerIPRank() is in network byte order but
really needs to be in host byte order.

Note: This patch assumes that change I66f5c790d8c55b359e3550b6d71f3abe040a2820
      has been previously installed. The patch fails otherwise.
Change-Id: I3078da1efb94f87f84dbe357f3272d908818256b
Reviewed-on: http://gerrit.openafs.org/3402
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>