Make the warning in DynamicLibraryTestCase actually visible

Using wxLogWarning() doesn't work as logs are suppressed by default, but
using CATCH WARN() macro does work.

tests/misc/dynamiclib.cpp

@@ -60,8 +60,8 @@ void DynamicLibraryTestCase::Load()
 
     if ( !wxFileName::Exists(LIB_NAME) )
     {
-        wxLogWarning("Shared library \"%s\" doesn't exist, "
+        WARN("Shared library \"" << wxString(LIB_NAME) << "\" doesn't exist, "
-                     "skipping DynamicLibraryTestCase::Load() test.", LIB_NAME);
+             "skipping DynamicLibraryTestCase::Load() test.");
         return;
     }
 #else