ActiveQt: Signals of a activeQt server do not generate corresponding event entries in IDL file.

Event entries are not getting generated to IDL files of activeQt servers. Works in Qt4.

Seems that the issue stems from the fact that "void" return type is now correctly returned as such when queried from QMetaMethod::typeName(). This also causes a bunch of warnings from QVariant at runtime: "Trying to create a QVariant instance of QMetaType::Void type, an invalid QVariant will be constructed instead".