- move PAM_MODUTIL_DEF_PRIVS below parse_cfg, so that cfg->debug_file   gets initialized first (this is c99, statement before decl). - introduce free_const() macro to avoid const cast-away warnings. - Add PAM_MODULE_ENTRY() macro used by OpenPAM.
- move PAM_MODUTIL_DEF_PRIVS below parse_cfg, so that cfg->debug_file
  gets initialized first (this is c99, statement before decl).
- introduce free_const() macro to avoid const cast-away warnings.
- Add PAM_MODULE_ENTRY() macro used by OpenPAM.

Yubico/pam-u2f,Yubico/pam-u2f,Yubico/pam-u2f