configure: Use AC_SYS_LARGEFILE to enable large file support

The only files libICE operates on are .ICEauthority files, which
it only uses internally and does not make available to other code,
so there is no concern about ABI mismatch here.

While .ICEauthority files should never be more than 2gb in size,
they may be stored on filesystems with large inodes.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

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