qemu-queue: drop QCIRCLEQ
The main advantage of circular lists (the fact that the head node has the same memory layout as any other node) is completely negated by the implementation in qemu-queue.h. Not surprisingly, nobody uses QCIRCLEQ. While this might change if RCU is ever adopted by QEMU, the QLIST is also RCU-friendly and in fact it is used in a RCU-like manner by 9pfs already. So, just kill QCIRCLEQ. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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