* m4/utimbuf.m4: Remove unused file.

m4/utimbuf.m4

-# serial 9
-
-# Copyright (C) 1998-2001, 2003-2004, 2007, 2009-2019 Free Software
-# Foundation, Inc.
-#
-# This file is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-dnl From Jim Meyering
-
-dnl Define HAVE_STRUCT_UTIMBUF if 'struct utimbuf' is declared --
-dnl usually in <utime.h>.
-dnl Some systems have utime.h but don't declare the struct anywhere.
-
-AC_DEFUN([gl_CHECK_TYPE_STRUCT_UTIMBUF],
-[
-  AC_CHECK_HEADERS_ONCE([sys/time.h utime.h])
-  AC_CACHE_CHECK([for struct utimbuf], [gl_cv_sys_struct_utimbuf],
-    [AC_COMPILE_IFELSE(
-       [AC_LANG_PROGRAM(
-          [[#if HAVE_SYS_TIME_H
-             #include <sys/time.h>
-            #endif
-            #include <time.h>
-            #ifdef HAVE_UTIME_H
-             #include <utime.h>
-            #endif
-          ]],
-          [[static struct utimbuf x; x.actime = x.modtime;]])],
-       [gl_cv_sys_struct_utimbuf=yes],
-       [gl_cv_sys_struct_utimbuf=no])])
-
-  if test $gl_cv_sys_struct_utimbuf = yes; then
-    AC_DEFINE([HAVE_STRUCT_UTIMBUF], [1],
-      [Define if struct utimbuf is declared -- usually in <utime.h>.
-       Some systems have utime.h but don't declare the struct anywhere. ])
-  fi
-])