Revert "Update Gnulib to v0.1-603-g1d16a7b"

This reverts commit 2d4da30fde.

This Gnulib update was causing failures related to timezones in
stime.c.  I tried to fix it by adopting the time_rz module from gnulib
but that then caused other failures.  We can try again later.

lib/strftime.h

@@ -1,6 +1,6 @@
 /* declarations for strftime.c
 
-   Copyright (C) 2002, 2004, 2008-2015 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2004, 2008-2014 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
@@ -23,10 +23,11 @@ extern "C" {
 
 /* Just like strftime, but with two more arguments:
    POSIX requires that strftime use the local timezone information.
-   Use the timezone __TZ instead.  Use __NS as the number of
-   nanoseconds in the %N directive.  */
+   When __UTC is nonzero and tm->tm_zone is NULL or the empty string,
+   use UTC instead.  Use __NS as the number of nanoseconds in the
+   %N directive.  */
 size_t nstrftime (char *, size_t, char const *, struct tm const *,
-                  timezone_t __tz, int __ns);
+                  int __utc, int __ns);
 
 #ifdef __cplusplus
 }