For posterity, these are the rules for access on Windows (taken from
CPython's implementation), Access is possible if:
* Write access wasn't requested
* The file isn't read-only
* It's a directory (directories cannot be read-only on Windows)
PR-URL: https://github.com/libuv/libuv/pull/316
Reviewed-By: Bert Belder <bertbelder@gmail.com>