win: return product name in uv_os_uname() version
win: return product name in uv_os_uname() version

Currently, on Windows the uv_utsname_t's version field can
be an empty string if no service packs are installed. This isn't
very helpful, and a lot more information is available in the
Windows registry. This commit prepends the full product name
to the existing service pack information.

Refs: https://github.com/nodejs/node/issues/25843
Refs: https://github.com/libuv/libuv/pull/2128#issuecomment-452109129
PR-URL: https://github.com/libuv/libuv/pull/2170
Reviewed-By: Refael Ackermann <0604a90ccdde7a0adfa2ff3857349859a7209740@gmail.com>
Reviewed-By: Bartosz Sosnowski <aa4e0bd35c562885f21ad74b171c23cfc4370e31@janeasystems.com>

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso