[Dune] [#962] Fix compilation with clang

[Dune]

THIS IS AN AUTOMATED MESSAGE, DO NOT REPLY.

A Project Manager has denied the request pending for the following task:

FS#962 - Fix compilation with clang
User who did this - Christian Engwer (christi)

Reason for denial:
pending patch submitted

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=962

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