mappkgname: Add oasis and its dependencies

Signed-off-by: Euan Harris <euan.harris@citrix.com>
ocaml-fileutils: Move configure call into build step

Calling configure in the setup step means that makedeb runs it
outside the chroot when creating the source deb.   This means
that paths from outside the chroot are captured in the setup
files in the binary, which may cause it not to build inside
the chroot.

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