Patching the latest gnum4 so it builds with glibc 2.12.1

svn path=/nixpkgs/branches/stdenv-updates/; revision=23306

pkgs/development/tools/misc/gnum4/default.nix

···
 
   doCheck = !stdenv.isDarwin;
 
+  # Upstream is aware of it; it may be in the next release.
+  patches = [ ./s_isdir.patch ];
+
   meta = {
     homepage = http://www.gnu.org/software/m4/;
     description = "GNU M4, a macro processor";

pkgs/development/tools/misc/gnum4/s_isdir.patch

···
+Fails to build with glibc 2.12.1 without this patch.
+
+http://lists.gnu.org/archive/html/bug-m4/2010-05/msg00002.html
+
+--- a/src/path.c
++++ b/src/path.c
+@@ -22,6 +22,7 @@
+ /* Handling of path search of included files via the builtins "include"
+    and "sinclude".  */
+ 
+ #include "m4.h"
++#include "sys/stat.h"
+ 
+ struct includes