FYI: check-module: add at-func.c to white-list

[Jim Meyering]

Checking openat produced this:

  $ cd modules && ../check-module openat
  check-module: ../lib/openat.c: duplicate inclusion of at-func.c
  check-module: ../lib/openat.c: duplicate inclusion of at-func.c

So I fixed it:

        * check-module (find_included_lib_files): Add at-func.c to the
        ok-to-include-more-than-once white list.

Index: check-module
===================================================================
RCS file: /sources/gnulib/gnulib/check-module,v
retrieving revision 1.5
diff -u -r1.5 check-module
--- check-module        14 Aug 2006 18:28:31 -0000      1.5
+++ check-module        21 Aug 2006 08:20:07 -0000
@@ -156,7 +156,8 @@
   my ($file) = @_;
 
   # Special cases...
-  my %special_non_dup = ( 'fnmatch_loop.c' => 1, 'regex.c' => 1 );
+  my %special_non_dup = ( 'fnmatch_loop.c' => 1,
+                         'regex.c' => 1, 'at-func.c' => 1 );
 
   my %inc;
   open FH, '<', $file