bio: pass flags on BIO_ctrl to make flush retriable #1069

Job	Run time
run-checker (no-cmp)	8m 21s
run-checker (no-cms)	8m 30s
run-checker (no-dgram)	9m 14s
run-checker (no-dh)	8m 9s
run-checker (no-dtls)	8m 30s
run-checker (no-ec)	6m 25s
run-checker (no-ec2m)	8m 49s
run-checker (no-ecx)	6m 58s
run-checker (no-http)	7m 50s
run-checker (no-legacy)	7m 1s
run-checker (no-sock)	9m 17s
run-checker (enable-ssl-trace)	9m 32s
run-checker (no-threads)	8m 12s
run-checker (no-thread-pool)	8m 31s
run-checker (no-default-thread-pool)	7m 3s
run-checker (no-tls)	8m 20s
run-checker (no-tls1_2)	8m 22s
run-checker (no-tls1_3)	6m 39s
run-checker (enable-trace enable-fips)	7m 58s
run-checker (no-ui)	8m 47s
run-checker (no-quic)	9m 11s
	2h 51m 39s

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