MSVCRT: implement _chsize

[Hans Leidekker]

This one restores the filepointer (test to confirm included)
and includes a shy attempt at being thread safe. It uses the 
existing lock but that one only seems to protect operations
on fd's and it's not even used consequently in all functions
(I smell a janitorial ;).

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This should fix apps built with MinGW (bug report 2826).

 -Hans

Changelog:
  Implement and test _chsize.
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