1.7.8: write fails with EAGAIN

[Robert Wruck]

Hi,

tested with cvs HEAD:

> Just terminating the loop after write_overlapped_fallback is not enough.
> When the size to write exceeds MAX_OVERLAPPED_WRITE_LEN and WriteFile
> fails for MAX_OVERLAPPED_WRITE_LEN, write() will always return 0.

Now any write with length > MAX_OVERLAPPED_WRITE_LEN fails with -1 / 
EFBIG (on the machine that has the WriteFile limitation).

-Robert

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