Log Message:
Add patch to resolve gpgsm S/MIME failures

S/MIME messages encrypted with gpgsm are sometimes not decodable by
other implementations.  Discussion on gnupg-devel indicates that gpg
(via libksba) is incorrectly dropping leading zeros from the encrypted
session key.  This commit adds a patch by Daiki Ueno from the
mailinglist that appears to improve interoperability.  Upstream has
not yet applied it, but also has not said that it is wrong.