autogen.sh: Add rule for 64 bit windows.
speedo: Minor improvements.

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speedo: Add support for gpgex.

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Speedo is now able to build gpgex for Windows.  Building gpa for
Windows does not yet work due to a bunch of other dependencies.
Add secp256k1.

* common/openpgp-oid.c (openpgp_curve_to_oid): Add secp256k1.
(openpgp_oid_to_curve): Likewise.

* g10/keygen.c (ask_curve): Add secp256k1.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
agent: Fix agent_is_eddsa_key.

* agent/findkey.c (agent_is_eddsa_key): Implemented.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
agent: Not remove SSH socket when already running.

* agent/gpg-agent.c (main): Defer setting of socket_name_ssh to avoid
removal of the socket when it will die in create_server_socket for
socket_name.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>