libgcrypt: Update to 1.8.0

libgcrypt: Update to 1.8.0

Changes (see: https://gnupg.org/download/release_notes.html):

"gpg: Sending very large keys to the keyservers works again.
gpg: Validity strings in key listings are now again translatable.
gpg: Emit FAILURE status lines to help GPGME.
gpg: Does not anymore link to Libksba to reduce dependencies.
gpgsm: Export of secret keys via Assuan is now possible.
agent: Raise the maximum passphrase length from 100 to 255 bytes.
agent: Fix regression using EdDSA keys with ssh.
Does not anymore use a build timestamp by default.
The fallback encoding for broken locale settings changed from Latin-1 to UTF-8.
Many code cleanups and improved internal documentation.
Various minor bug fixes."

Best,
Matthias

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>