des crypt cope with 64 bit longs

des crypt cope with 64 bit longs

we test for them in configure; instead of hardcoding it in yet
another place, use the information we have

Reviewed-on: http://gerrit.openafs.org/442
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 98f9b6ae2bafe69440c090443efb2f71ec15309c)
Change-Id: Ied35fdf7c325dbc63bdef1e1ebb328c455bc0133
Reviewed-on: http://gerrit.openafs.org/957