Continuation of 5bb14c07dc.
The earlier commit provided the space savings (as the linker could see
through that osexec was unused at runtime), but it didn't clean up the
dep graph (from go list -json or godepgraph).
This removes the netstat.go file from the build too, just so the dep list
looks more reasonable.
The function is indeed unused on linux, but we want it around
so that unit tests exercise the netstat logic even on linux,
even if it's only used on !linux.
Signed-off-by: David Anderson <dave@natulte.net>
