FIX: PluginFramework: Added missing include for Linux

Libs/PluginFramework/Testing/Cpp/ctkLDAPExpreTest.cpp

@@ -22,6 +22,7 @@
 #include "ctkLDAPExpr.h"
 
 #include <iostream>
+#include <cstdlib>
 
 #include <QVariant>
 
@@ -141,4 +142,4 @@ int TestEvaluate( )
   }
 
   return EXIT_SUCCESS;
-}
+}