Try to lookup a gobject.types.TYPE_FLAG_RESERVED_ID_BIT via the given function name, specified
explicitly in a GtkBuilder file, like via the "type-func" attribute in the <object> tag.
This function is very rarely used.
The C implementation will use dlsym() and call the resulting function as a GTypeFunc.
The default implementation will fail and just return G_TYPE_INVALID.
Try to lookup a gobject.types.TYPE_FLAG_RESERVED_ID_BIT via the given function name, specified explicitly in a GtkBuilder file, like via the "type-func" attribute in the <object> tag. This function is very rarely used. The C implementation will use dlsym() and call the resulting function as a GTypeFunc. The default implementation will fail and just return G_TYPE_INVALID.