vo_xv: allocate Xv images with aligned stride

This is required, as the Xv image is directly used for rendering OSD and
taking screenshots. These involve libswscale, which wants aligned
strides.

There doesn't seem to be an easy way to request aligned strides from Xv.
Simply request an image with an aligned width, which usually results in
an aligned stride. The padding border remains invisible.

One caveat is that if padding is added, there might be scaling artifacts
on the right pixel border of the screen. This is at least the case with
nvidia binary drivers. Since we consider vo_xv a sensible choice only on
crappy/slow hardware, performance is more important than quality.

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