Resolve "Update: Signal Processing Third party Eigen"

Closes #158 (closed)

plugins/processing/classification/src/algorithms/ovpCAlgorithmClassifierMLP.cpp

-#if defined TARGET_HAS_ThirdPartyEIGEN
-
 #include "ovpCAlgorithmClassifierMLP.h"
 #include "../ovp_defines.h"
 
@@ -473,4 +471,3 @@ void CAlgorithmClassifierMLP::loadData(XML::IXMLNode* node, double& value)
 }  // namespace Classification
 }  // namespace Plugins
 }  // namespace OpenViBE
-#endif  // TARGET_HAS_ThirdPartyEIGEN