net: remove unused linknames
errNoSuchInterface:
https://github.com/SagerNet/sing/commit/
a33349366d899068145f2d0e3ea0f5b2632fa3f2
defaultNS:
https://github.com/MetaCubeX/mihomo/commit/
4a16d22398116a88a230071278be536491a8cdce
For #67401
Change-Id: I2945bc5edf8a474315283c57259ba6c2a0b85776
Reviewed-on: https://go-review.googlesource.com/c/go/+/721161
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Mark Freeman <markfreeman@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>