wgengine/router: look up absolute path to netsh.exe on Windows

This is in response to logs from a customer that show that we're unable
to run netsh due to the following error:

    router: firewall: adding Tailscale-Process rule to allow UDP for "C:\\Program Files\\Tailscale\\tailscaled.exe" ...
    router: firewall: error adding Tailscale-Process rule: exec: "netsh": cannot run executable found relative to current directory:

There's approximately no reason to ever dynamically look up the path of
a system utility like netsh.exe, so instead let's first look for it
in the System32 directory and only if that fails fall back to the
previous behaviour.

Updates #10804

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I68cfeb4cab091c79ccff3187d35f50359a690573

0 files changed, 0 insertions, 0 deletions