Largefile tests

[Joerg Schilling]

Hi, it seems that the large file tests from GNU tar are making
problems on old Linux systems with Glibc-2.1.3

If you #define _XOPEN_SOURCE to 500 
some important typedefs from sys/types.h become invisible
(e.g. caddr_t and daddr_t) both are needed for some ioctl's.


I propose to ommit the last test:

     AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500, 
       ac_cv_sys_xopen_source, 
       [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).], 
       [#include <stdio.h>], [return !ftello;]) 


and rather tell people with glibc-2.1.3 that they need to upgrade
if they like to use large file programs instead.

Jörg

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