include stdio.h for newer gcc

sesman/verify_user.c

@@ -28,6 +28,7 @@
 #include "sesman.h"
 
 #define _XOPEN_SOURCE
+#include <stdio.h>
 #include <sys/types.h>
 #include <crypt.h>
 #include <shadow.h>

sesman/verify_user_pam.c

@@ -28,6 +28,7 @@
 #include "arch.h"
 #include "os_calls.h"
 
+#include <stdio.h>
 #include <security/pam_appl.h>
 
 struct t_user_pass