[RESEND PATCH v1 wireguard-tools] ipc: linux: Support incremental allowed ips updates

[Jordan Rife]

> > Merged here:
> > https://git.zx2c4.com/wireguard-tools/commit/?id=0788f90810efde88cfa07ed96e7eca77c7f2eedd
> > 
> > With a followup here:
> > https://git.zx2c4.com/wireguard-tools/commit/?id=dce8ac6e2fa30f8b07e84859f244f81b3c6b2353
> 
> Also,
> https://git.zx2c4.com/wireguard-go/commit/?id=256bcbd70d5b4eaae2a9f21a9889498c0f89041c

Nice, cool to see this extended to wireguard-go as well. As a follow up,
I was planning to also create a patch for golang.zx2c4.com/wireguard/wgctrl
so the feature can be used from there too.

Jordan