Small fix to "correctly" parse PGP inline signed mails by (presumingly) GPGMail 1.4.1

(I would be interested in discussion on Mail formats, as this is a very rough patch)
Mail that could not be parsed where of format:

Content-Type: application/pgp; format=text; x-action=sign

and inline separators as:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

<body>
-----BEGIN PGP SIGNATURE-----

<signature>
-----END PGP SIGNATURE-----

former version only tried to decrypt body, which in this case obviously
fails.