ocaml-sha: Fix bogus date in changelog

Signed-off-by: Euan Harris <euan.harris@citrix.com>
ocaml-xenstore: Fix bogus date in changelog

Signed-off-by: Euan Harris <euan.harris@citrix.com>
squeezed: Fix bogus date in changelog

Signed-off-by: Euan Harris <euan.harris@citrix.com>