Bug#1000170: Not compatible with experimental xserver-xorg-core 21.1.1

[Yuri D'Elia]

Package: xserver-xorg-video-dummy
Version: 1:0.3.8-1+b1
Severity: normal

xserver-xorg-video-dummy depends on xorg-video-abi-24, but the new
release of xorg 21.1 on experimental provides xorg-video-abi-25