Cannot wrap sigsetjmp() or we end up returning to the wrong place.

Use a macro instead.

plugins/sudoers/sudoers.h

@@ -369,11 +369,6 @@ int group_plugin_query(const char *user, const char *group,
 /* setgroups.c */
 int sudo_setgroups(int ngids, const GETGROUPS_T *gids);
 
-/* plugin_error.c */
-int plugin_setjmp(void);
-void plugin_clearjmp(void);
-void plugin_longjmp(int val) __attribute__((__noreturn__));
-
 #ifndef _SUDO_MAIN
 extern struct sudo_user sudo_user;
 extern struct passwd *list_pw;