Silence prototype conflicts

Silence prototype conflicts

Forwarded: https://github.com/dovecot/core/pull/206

    program-client.c:705:5: warning: conflicting types for 'program_client_run' due to enum/integer mismatch; have 'int(struct program_client *)' [-Wenum-int-mismatch]
      705 | int program_client_run(struct program_client *pclient)
          |     ^~~~~~~~~~~~~~~~~~
    In file included from program-client-private.h:4,
                     from program-client.c:17:
    program-client.h:93:1: note: previous declaration of 'program_client_run' with type 'enum program_client_exit_status(struct program_client *)'
       93 | program_client_run(struct program_client *pclient);
          | ^~~~~~~~~~~~~~~~~~

    db-lua.c:599:1: warning: conflicting types for 'auth_lua_call_password_verify' due to enum/integer mismatch; have 'enum passdb_result(struct dlua_script *, struct auth_request *, const char *, const char **)' [-Wenum-int-mismatch]
      599 | auth_lua_call_password_verify(struct dlua_script *script,
          | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    In file included from db-lua.c:28:
    db-lua.h:14:5: note: previous declaration of 'auth_lua_call_password_verify' with type 'int(struct dlua_script *, struct auth_request *, const char *, const char **)'
       14 | int auth_lua_call_password_verify(struct dlua_script *script,
          |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Gbp-Pq: Name Silence-prototype-conflicts.patch