dgram: improve get-send-queue-info performance #246

Job	Run time
Build slim tarball	1m 36s
aarch64-linux: with shared libraries	24m 10s
x86_64-darwin: with shared libraries	37m 13s
aarch64-darwin: with shared libraries	24m 18s
x86_64-linux: with shared libraries	28m 34s
	1h 55m 51s

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