mutt{,-kz}: add upstream patch for better S/MIME support, bump PKGREVISION.

# HG changeset patch
# User Kevin McCarthy <kevin@8t8.us>
# Date 1449022827 28800
#      Tue Dec 01 18:20:27 2015 -0800
# Node ID 5e5aff1782dc62044197c2230d346bd492706fbf
# Parent  428a92464d5bccccda818bed598610db212fcf7c
Loosen mutt_signed_handler() protocol value consistency check.  (closes #3639)

Apparently, for S/MIME, some MUAs mismatch the protocol value of
the multipart/signed and the content-type of the signature: putting
"pkcs7-signature" in one and "x-pkcs7-signature" in the other.

Change mutt_signed_handler() to independently verify the values of the
protocol and the content-type.  This still checks for correct values but
doesn't ensure they match between the two (for S/MIME).

(wiz)