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notify: add NotiferWithReturn so notifier list can abort
notifier_list_notify() has no return value. This is fine when we justwant to invoke side-effects.
Sometimes it's useful for notifiers to produce a return value. Thisallows notifiers to "veto" an operation and will be used by the block...
build: move libqemuutil.a components to util/
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>