ocaml update, please test

Hi!

Attached diff updates the ocaml port to ocaml 3.07. It would be great if people could test this on alpha, sparc and macppc. If it successfully builds a package, everything should be fine.

Note: Be sure to remove empty patchfiles after applying this diff!

Unfortunately this update breaks net/mldonkey and math/coq. If anyone could provide fixes for those ports, this update might even get committed. :)

bye,

Nikolay

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