reentrant fclose

[Artem B. Bityuckiy]

Hello.

I've added reentrant version of fclose (_fclose_r). Please, see attached 
patches and commit if consider necessary.

fclose.c.patch - Add reentrant _fclose_r function. Update documentation.
fcloseall.c.patch, freopen.c.patch, freopen64.c.patch  - Use reentrant 
_fclose_r instead of fclose.
stdio.h.patch - Add _fclose_r prototype.
fopen.c.patch - Fix documentation typo.

-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.
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