Bug#517327: camlimages: Missing build-depends on dh-ocaml

[Jonathan Nieder <jrnieder@gmail.com>]

Source: camlimages
Version: 1:2.2.0-4

camlimages fails to build from source in unstable:

		 fakeroot debian/rules clean
		debian/rules:23: /usr/share/cdbs/1/class/ocaml.mk: No such file or directory
		make: *** No rule to make target `/usr/share/cdbs/1/class/ocaml.mk'. Stop.

Now ocaml.mk is provided by dh-ocaml instead of ocaml-nox.  I have not
tried building with dh-ocaml yet.

(This bug is very similar to http://bugs.debian.org/517323 . Sorry for
the noise.)