Fix -Wunused-parameter warning with exceptions disabled

Closes #3114

src/catch2/catch_translate_exception.hpp

@@ -41,6 +41,8 @@ namespace Catch {
                     return m_translateFunction( ex );
                 }
 #else
+                (void)it;
+                (void)itEnd;
                 return "You should never get here!";
 #endif
             }