avcodec: prioritise vaapi over vdpau
Favor VAAPI over VDPAU: VDPAU is deprecated and present on less systems than VAAPI. Furthermore, the try and fail of VDPAU vout/va take much longer than the VAAPI one (around twice the time, that is 100-200ms). VAAPI will only be used for direct rendering by default, so VDPAU will still be used instead of VAAPI with CPU copy.
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