svga: Add a more elaborate format compatibility determination v2

dri3 is a bit sloppy about its format compatibility requirements, so add
a possibility to import xrgb surfaces as argb textures and vice versa.

At the same time, make the svga_texture_from_handle() function a bit more
readable and fix the error path where we leaked a winsys surface.

v2: Addressed review comments by Brian.

Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Charmaine Lee <[email protected]>

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