dgram: improve get-send-queue-info performance #546

Job	Run time
Build slim tarball	1m 37s
x86_64-darwin: with shared libraries	46m 56s
x86_64-linux: with shared libraries	28m 42s
aarch64-linux: with shared libraries	24m 20s
aarch64-darwin: with shared libraries	30m 6s
	2h 11m 41s

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