Bug#1106554: Re; openvpn-dco-dkms: module fails to build for Linux 6.15: implicit declaration of function 'del_timer_sync'

[Christian Kujau]

FWIW, the OpenVPN DCO module has just been upstreamed with 6.16. Depending 
on which kernel will land in Debian/sid, the openvpn-dco-dkms package may 
no longer be necessary.