[PATCH] compat: support building for RHEL-8.2

[Jason A. Donenfeld]

I would up merging this anyway with a justification in the git commit for it:

https://git.zx2c4.com/wireguard-linux-compat/commit/?id=003fb6ee9502741f41cb2563d2916172d98f5fd1

Thanks for the patch.

Jason