package/wireguard-linux-compat: bump version to 0.0.20200215

Fixes a regression introduced in 0.0.20200214.  For details, see the
announcement:
https://lists.zx2c4.com/pipermail/wireguard/2020-February/005014.html



Signed-off-by: Peter Korsgaard <peter@korsgaard.com>