[Patch] Fix seekoff/pos and sputbackc testcases

[Paolo Carlini]

Hi,

the below provides correct unbuffered seekoff/pos testcases and
fixes the existing buffered ones together with those for sputbackc
(both unbuffered and buffered).

Now all the buffered testcases are identical to the unbuffered
counterparts, as should be.

In the near future I'd like to provide some more seek testcases
for pure in and out.

Tested x86-linux, ok with you?

Paolo

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