[PATCH] Increase performance on Windows by up to 2x

[Bryan O'Sullivan]

This patch replaces the util_win32 module's posixfile_nt class with a C
wrapper that lets Mercurial use Python's normal file handling code. That
code uses buffered I/O for reads and writes, so is substantially faster in
many cases than the existing code which goes through the win32 I/O APIs. In
case the C extension is not available, we still fall back to the current
code.
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