eolian_cxx: Fix "unused parameter" warnings

The Klass(Klass &&other) one was causing "synthesized method ... first
required here' warnings on Windows gcc-4.8.

src/lib/eolian_cxx/grammar/class_definition.hpp

@@ -55,10 +55,10 @@ struct class_definition_generator
          << scope_tab << string << "(std::nullptr_t)\n"
          << scope_tab << scope_tab << ": ::efl::eo::concrete(nullptr) {}\n"
          << scope_tab << "explicit " << string << "() = default;\n"
-         << scope_tab << string << "(" << string << " const& other) = default;\n"
-         << scope_tab << string << "(" << string << "&& other) = default;\n"
-         << scope_tab << string << "& operator=(" << string << " const& other) = default;\n"
-         << scope_tab << string << "& operator=(" << string << "&& other) = default;\n"
+         << scope_tab << string << "(" << string << " const&) = default;\n"
+         << scope_tab << string << "(" << string << "&&) = default;\n"
+         << scope_tab << string << "& operator=(" << string << " const&) = default;\n"
+         << scope_tab << string << "& operator=(" << string << "&&) = default;\n"
          << scope_tab << "template <typename Derived>\n"
          << scope_tab << string << "(Derived&& derived\n"
          << scope_tab << scope_tab << ", typename std::enable_if<\n"