Require Libgcrypt 1.6
* agent/pksign.c (do_encode_dsa): Remove Libgcrypt version check
Now that we have decided on a release plan for Libgcrypt 1.6 and given
all the improvements it makes more sense to make use of these
improvements than to clutter the GnuPG code with workarounds for older
Libgcrypt versions.