I've found a web-browsable VCS view of the mesa repository and noticed that the fix was committed upstream back in June:
http://gitweb.freedesktop.org/?p=users/krh/mesa.git;a=commit;h=efbed00f7661aaf2bfad19e57e6b4d4c3623c9eb -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]