Segfault with pkcs7 message

[Holger Schurig]

The attached e-mail makes notmuch from git HEAD segfault:

$ notmuch --version
notmuch 0.25.1+161~g1b91884
$ notmuch show --decrypt id:86595dab-d486-536b-fe7a-ae3e1dca1a26 at posteo.de
Warning: Crypto engine initialization failure (application/pkcs7-signature).
Segmentation fault


Without the --decrypt I can see the visible text, but I'm unaware on how I
can make the elisp code not send this command line option.
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