gpg: Allow shortcut algo string "pqc" for --quick-gen-key.
* g10/keygen.c (PQC_STD_KEY_PARAM): New. (quickgen_set_para): Always store the provided NBITS. (parse_key_parameter_string): Detect the special value "pqc". (quick_generate_keypair): Ditto.
With this change we can finally do a
gpg --quick-gen-key --batch --passphrase='' foo@example.org pqc
and get a full key. Currently with a brainpoolp386r1 primary key and
a Kyber768_brainpoolp256 subkey.