When running a login shell with a login_class specified, use

LOGIN_SETENV instead of rolling our own login.conf setenv support
since FreeBSD's login.conf has more than just setenv capabilities.
This requires us to swap the plugin-provided envp for the global
environ before calling setusercontext() and then stash the resulting
environ pointer back into the command details, which is kind of a
hack.

plugins/sudoers/sudoers.h

@@ -197,7 +197,6 @@ struct lbuf;
 struct passwd;
 struct stat;
 struct timeval;
-struct login_cap;
 
 /*
  * Function prototypes
@@ -306,7 +305,6 @@ void init_envtables(void);
 void insert_env_vars(char * const envp[]);
 void read_env_file(const char *, int);
 void rebuild_env(void);
-void sudo_setenv(const char *var, const char *val, int dupcheck);
 void validate_env_vars(char * const envp[]);
 
 /* fmt_string.c */
@@ -330,9 +328,6 @@ int group_plugin_query(const char *user, const char *group,
 /* setgroups.c */
 int sudo_setgroups(int ngids, const GETGROUPS_T *gids);
 
-/* login_cap.c */
-int sudo_login_setenv(struct login_cap *lc, const struct passwd *pwd);
-
 #ifndef _SUDO_MAIN
 extern struct sudo_user sudo_user;
 extern struct passwd *list_pw;