In certain circumstances, Exchange corrupts a multipart/encrypted block
into:
  <multipart/mixed>
    <text/plain>
    <application/pgp-encrypted> [BASE64-encoded]
    <application/octet-stream> [BASE64-encoded]

This patch pulls the full detection of valid/invalid multiparts
into mutt_body_handler().  It extracts a run_decode_and_handler()
function, which is reused by new intermediate handlers to decode
the application/octet-stream part before passing it directly to
crypt_pgp_encrypted_handler.  These intermediate handlers then check
and set any GOODSIG flags back into the parent part.

This change may result in less error messages for invalid
multipart/encrypted parts.  Instead, mutt will default to the
multipart_handler if it isn't fully "correct".

Viewing attachments uses crypt_pgp_decrypt_mime() which bypasses the
handler mechanism.  Add decoding to the decrypt_mime() functions for pgp
and gpgme.

Thanks to Vincent Brillault for his analysis and initial patch.