compability for sys-devel/autoconf-2.62

https://bugs.gentoo.org/show_bug.cgi?id=217311

--- screen/config.h.in
+++ screen/config.h.in
@@ -563,7 +563,6 @@
  * If you are on a SYS V machine that restricts filename length to 14 
  * characters, you may need to enforce that by setting NAME_MAX to 14
  */
-#undef NAME_MAX		/* KEEP_UNDEF_HERE override system value */
 #undef NAME_MAX
 
 /*