ngtcp2: Allow curl to send larger UDP datagrams #8883
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Allow curl to send larger UDP datagram if Path MTU Discovery finds the
availability of larger path MTU. To make it work and not to send
fragmented packet, we need to set DF bit. That makes send(2) fail
with EMSGSIZE if UDP datagram is too large. In that case, just let it
lost. This patch enables DF bit for Linux only.