Generate synchronous methods alongside asynchronous methods

(cherry picked from commit a111d47e9c)

tools/dbusxml2qt3/methodgen.cpp

@@ -592,6 +592,10 @@ bool MethodGenerator::extractMethods(const TQDomElement& interfaceElement,
             {
                 method.async = hasAnnotation(element, "org.freedesktop.DBus.GLib.Async");
                 classData.methods.append(method);
+                if (method.async) {
+                    method.async = false;
+                    classData.methods.append(method);
+                }
             }
             else
                 classData.msignals.append(method);