windows: define snprintf replacement as inline instead of static
windows: define snprintf replacement as inline instead of static

The MSVC compiler does not accept static methods defined in headers,
when linking against a shared library. The snprintf replacement
function used for windows, is now an inline function.

PR-URL: https://github.com/libuv/libuv/pull/329
Reviewed-By: Saúl Ibarra Corretgé <8a7991f6950ea189abf159d6ec98d2fcc13dc5f6@gmail.com>

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