meson.build: Keep the protocol version looking like xserver 1.20.x did
This effectively changes the versioning to be as if xserver 21.0 was xserver 1.21.0. This should keep any client-side version checks that know about the Xorg 7.0 -> xserver 1.0 epoch from getting confused. Fixes: 1e72c3ce "Bump version to 188.8.131.52"
xwayland-21.1-protocol-version-backcompat in 2 minutes and 24 seconds (queued for 1 second)3 jobs for