gpg: Curvenames may now compared case insensitive.
* common/openpgp-oid.c (openpgp_curve_to_oid): Repalce strmcp by ascii_strcasecmp. (openpgp_oid_or_name_to_curve): Ditto. (openpgp_is_curve_supported): Ditto. (get_keyalgo_string): Ditto.
It was just to hard to remember the correct capitalization of
names like brainpoolP512r1.