[jlgaddis]

2011-12-31, it looks like, so it's been there for a couple of years already (introduced between 1.0.0f and 1.0.1):

http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=...

[ge0rg]

Wow, a code change introduced around New Year's Eve (depending on timezone), and authored by Robin Seggelmann, who also brought us DTLS-SCTP.