When also including an older recaptchalib.php this function gets redefined. Since it is only a wrapper function and only used within BOINC, renaming it is safe.

This allows a new simplified captcha that in some cases only makes the user
have to tick a checkbox; no need to type garbled characters or anything.
More info at:
http://googleonlinesecurity.blogspot.com/2014/12/are-you-robot-introducing-no-captcha.html

See http://boinc.berkeley.edu/trac/wiki/SimpleAttach