vl/dri3: use external texture as back buffers(v4)

dri3 allows us to send handle of a texture directly to X
so this patch allows a state tracker to directly send its
texture to X to be used as back buffer and avoids extra
copying

v2: use clip width/height to display a portion of the surface
v3: remove redundant variables, fix wrapping, rename variables
    handle vaapi path
v3.1: we need clip_width/height for every frame so we don't need
      to maintain it for each buffer instead use a global variable
v4: In case of single gpu we can cache the buffers as applications
    use constant number of buffer and we can avoid calls to present
    extension for every frame

Reviewed and Suggested-by: Leo Liu <[email protected]>
Acked-by: Christian König <[email protected]>
Tested-by: Andy Furniss <[email protected]>
Signed-off-by: Nayan Deshmukh <[email protected]>

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