[PATCH][BZ #14543] Fix fseek behaviour when called in wide mode

[Siddhesh Poyarekar]

Hi,

Ping? Here's an updated patch with some minor duplicated code removed
from the test case.

Regards,
Siddhesh

> ChangeLog:
> 
> 	* libio/Makefile (tests): New test case tst-fseek.
> 	(tst-fseek-ENV): Set localedata path for the test case.
> 	* libio/tst-fseek.c: New test case to verify that fseek/ftell
> 	combination works in wide mode.
> 	* libio/wfileops.c (_IO_wfile_seekoff): Adjust internal buffer
> 	state when the external buffer state changes.
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