Observe requirements for running `.cmd` scripts on Windows.
Observe requirements for running `.cmd` scripts on Windows.

The `child_process` documentation indicates that .cmd scripts (such as
the `npm.cmd` script for npm) must be started within a shell, such as
cmd.exe.

While it was tempting to switch this to use `child_process`'s `spawn`,
which supports a `shell` option, it would have required us to buffer
our own stdout/stderr output via `data` event handlers.

Ref: https://nodejs.org/api/child_process.html#child_process_spawning_bat_and_cmd_files_on_windows

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