These were added in upstream's 7e159e0133d28bec9148446e8f4dd86c0216d819 for
SCTP. As far as I can tell, they were a no-op there too. The corresponding RT
ticket makes no mention of them.
SSL_get_error checks the retry flags of the BIO already. Specifically it checks
BIO_should_read and BIO_should_write, but those two automatically set
BIO_should_retry.
(Minor, but I noticed them idly. One less thing to think about when the state
machines finally unify.)
Change-Id: I17a956a51895fba383063dee574e0fbe3209f9b0
Reviewed-on: https://boringssl-review.googlesource.com/3560
Reviewed-by: Adam Langley <agl@google.com>