gpg: Use enums instead of defines.
* g10/keydb.h (PK_LIST_ENCRYPT_TO): Change from a macro to an enum. (PK_LIST_HIDDEN): Likewise. (PK_LIST_CONFIG): Likewise. (PK_LIST_SHIFT): Likewise.n
Using an enum has the advantage that the symbol can be used in gdb.
- Signed-off-by: Neal H. Walfield <neal@g10code.com>