Include the needed <sys/stat.h> since recent glibc is stricter about that.

--- pam_login-3.35/src/login.c~	2007-05-04 14:07:49.000000000 +0200
+++ pam_login-3.35/src/login.c	2010-04-27 11:38:13.000000000 +0200
@@ -47,6 +47,7 @@
 #include <signal.h>
 #include <stdio.h>
 #include <string.h>
+#include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <sys/param.h>
 #include <sys/resource.h>