Add Brian Hatch's patch to enable RSA blinding on older OpenSSL versions.
Note: this patch is not needed for the 4.8-RELEASE ports tree, since
FreeBSD 4.8 will ship with a fixed OpenSSL version. However, this patch
SHOULD be applied by anyone running stunnel with a version of OpenSSL
older than 0.9.7a, as reported by the 'openssl version' command.
Submitted by: Brian Hatch <email@example.com>