Glib::Flags overloaded mutators

It'd be good if Glib::Flags had overloaded += as well as + so you could

        $f += 'val';

I think the basic overload can be used without too much trouble, the new
object returned being assigned to the destination automatically by

I remember a long time ago making mutators which peeked into the target
object and on refcount==1 changed it in-place instead of creating a new
one.  I guess that's possible with Glib::Flags too, though it's small
enough it might not be worth bothering.

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