[PATCH] [OCaml] fix syntax errors in linker test

[Ramkumar Ramachandra]

See d27b926.

-external link_modules : Llvm.llmodule -> Llvm.llmodule -> Mode.t -> unit
+external link_modules : Llvm.llmodule -> Llvm.llmodule -> unit


http://reviews.llvm.org/D6773

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