gpg: Add configure options to disable algorithms
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Description

gpg: Add configure options to disable algorithms

* acinclude.m4 (GNUPG_GPG_DISABLE_ALGO): New.
* configure.ac: Add --enable-gpg-* options to disable non MUS
algorithms.
* g10/misc.c (map_cipher_openpgp_to_gcry): Implement these options.
(openpgp_pk_test_algo2): Ditto.
(map_md_openpgp_to_gcry): Ditto.
(openpgp_cipher_test_algo, openpgp_md_test_algo): Simplify.

We have a similar feature in GnuPG-1. Although we don't shrink the
size of the gpg binary by disabling algorithms (they are implemented
in Libgcrypt), this feature may still be useful for inerop testing.