ChangeLog: add entry for today's dirfd change

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@@ -1,3 +1,11 @@
+2009-02-04  Jim Meyering  <meyering@redhat.com>
+
+       dirfd: set errno upon failure
+       * lib/dirfd.c: Include <errno.h>.
+       Set errno to ENOTSUP when returning -1.
+       * modules/dirfd (Depends-on): Add errno.
+       Suggested by John Kodis <kodis@comcast.net>.
+
 2009-02-01  Bruno Haible  <bruno@clisp.org>
 
        Don't assume sizeof (long) >= sizeof (void *).