Bug#1018830: Acknowledgement (linux-image-5.10.0-17-amd64: SO_RCVLOWAT only works reliably with select but not with recv)

[Michael Becker]

I have now added a SO_RCVTIMEO of ten seconds.
If first calling select the recv call returns after 3 seconds with 700 byte.
If not calling select the recv call returns after 10 seconds with 700 byte and 
errno=0

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