Fix chdir-long.m4 caching (was: megatest fallout)

[Ralf Wildenhues]

Hello Jim,

>       7 checking whether this system has an arbitrary file name length 
> limit... yes

OK to apply this patch?  I think this variable isn't used elsewhere in
gnulib nor coreutils, so renaming this shouldn't be a problem.

Cheers,
Ralf

        * chdir-long.m4 (gl_FUNC_CHDIR_LONG): Rename cache variable from
        `gl_have_arbitrary_file_name_length_limit' to
        `gl_cv_have_arbitrary_file_name_length_limit', so that caching
        actually works between configure runs.

Index: m4/chdir-long.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/chdir-long.m4,v
retrieving revision 1.5
diff -u -r1.5 chdir-long.m4
--- m4/chdir-long.m4    21 Aug 2006 21:46:31 -0000      1.5
+++ m4/chdir-long.m4    25 Sep 2006 19:57:14 -0000
@@ -1,4 +1,4 @@
-#serial 8
+#serial 9
 
 # Use Gnulib's robust chdir function.
 # It can handle arbitrarily long directory names, which means
@@ -16,17 +16,17 @@
 AC_DEFUN([gl_FUNC_CHDIR_LONG],
 [
   AC_CACHE_CHECK([whether this system has an arbitrary file name length limit],
-    gl_have_arbitrary_file_name_length_limit,
+    gl_cv_have_arbitrary_file_name_length_limit,
     [AC_EGREP_CPP([have_arbitrary_file_name_length_limit],
                   [#include <unistd.h>
 #include <limits.h>
 #if defined PATH_MAX || defined MAXPATHLEN
 have_arbitrary_file_name_length_limit
 #endif],
-    gl_have_arbitrary_file_name_length_limit=yes,
-    gl_have_arbitrary_file_name_length_limit=no)])
+    gl_cv_have_arbitrary_file_name_length_limit=yes,
+    gl_cv_have_arbitrary_file_name_length_limit=no)])
 
-  if test $gl_have_arbitrary_file_name_length_limit = yes; then
+  if test $gl_cv_have_arbitrary_file_name_length_limit = yes; then
     AC_LIBOBJ([chdir-long])
     gl_PREREQ_CHDIR_LONG
   fi