more targeted workaround for Windows Command bug

[dherman]

PR #159 applies a blunt fix by passing --silent to npm install. We should make it more targeted in a few ways:

• Do it only for cfg(windows).
• Verify that --loglevel error works and use that instead.
• Once std: Don't pass overlapped handles to processes rust-lang/rust#38835 merges in Rust nightly, verify that it works and then use something like rustc_version in the build.rs to decide dynamically based on the Rust version whether it's no longer necessary to use the workaround.

[kjvalencik]

No longer relevant for Node-API backend.