[PATCH] finally allow return(synth()) in vcl_deliver

[Nils Goroll]

I have revisited https://www.varnish-cache.org/trac/ticket/1027 and IIUC phk has
now done all the necessary groundwork to allow return(synth) in deliver:

cnt_synth returns with either REQ_FSM_MORE for VCL_RET_RESTART or REQ_FSM_DONE
after having called its custom delivery code path via V1D_Deliver_Synth(req).

The rest of the calling code in cnt_deliver is identical for restart and synth.

If you need historical background: Kristian had left helpful commit links and a
summary in https://www.varnish-cache.org/trac/ticket/1027
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