ocaml-xcp-idl: Add install dependency on message-switch
ocaml-xcp-idl: Add install dependency on message-switch

Note this dependency is added to the -devel package.

Signed-off-by: Euan Harris <c3b6e83069c8e9e3af49a38fec6026be89559638@citrix.com>

djs55/planex,simonjbeaumont/planex,simonjbeaumont/planex,simonjbeaumont/planex,djs55/planex,djs55/planex