Removed extern "C" from unittest.hxx.
Removed extern "C" from unittest.hxx.

funkey/vigra,funkey/vigra,dstoe/vigra,dstoe/vigra,funkey/vigra,dstoe/vigra,dagophil/vigra,funkey/vigra,dagophil/vigra,dagophil/vigra,dstoe/vigra,dstoe/vigra,funkey/vigra,dstoe/vigra,funkey/vigra,funkey/vigra,dagophil/vigra,dagophil/vigra,dstoe/vigra,dagophil/vigra,dagophil/vigra