Log Message:
libva: update to 2.20.0.

version 2.20.0 - 14.Sep.2023
* va: drop no longer applicable vaGetDriverNames check
* va: remove unreachable "DRIVER BUG"
* x11/dri2: limit the array handling to avoid out of range access
* va/backend: document the vaGetDriver* APIs
* va/backend: annotate vafool as deprecated
* win32: remove duplicate adapter_luid entry
* va: Added Q416 fourcc (three-plane 16-bit YUV 4:4:4)
* trace: fix minor issue about printf data type and value range
* jpeg: add support for crop and partial decode
* trace: Unlock mutex before return
* trace: Add trace for vaExportSurfaceHandle
* av1: Revise offsets comments for av1 encode
* va: Add new VADecodeErrorType to indicate the reset happended in the driver.
* drm: limit the array size to avoid out of range
* va: fix:set driver number to be zero if vaGetDriverNames failed
* va: fix:don't leak driver names, when override is set
* win32: Only print win32 driver messages in DEBUG builds
* va: Add vendor string on va_TraceInitialize
* va: remove legacy code paths
* drm: remove no longer used helpers
* x11: remove legacy code paths
* x11: allow disabling DRI3 via LIBVA_DRI3_DISABLE env var
* x11: implement vaGetDriverNames
* va/x11/va_nvctrl: remove some dead code
* va/x11/va_fglrx: remove some dead code
* va: optimize code of getting driver name for all \ 
protocols/os(wayland,x11,drm,win32,android)