protocol: screencopy: Extend to report linux-dmabuf capability
protocol: screencopy: Extend to report linux-dmabuf capability

A new version of the protocol is required so that the client can
discover which buffer types are supported by the compositor.

ascent12/wlroots,swaywm/wlroots,ascent12/wlroots,swaywm/wlroots,SirCmpwn/wlroots