Log Message:
libva: update to 1.7.3

rotate polarity of available.mk - BSDs and linux should work, but I've
only tested NetBSD. Only build tested, this package was updated due to
MesaLib configure requesting it.

Version 1.7.3 - 10.Nov.2016
* Bump VA API version to 0.39.4
* API: add support for bitrate control per temporal layer
* API: update the usage for framerate in VAEncMiscParameterFrameRate to support \ 
non-integer frame-rate
* Add has_prime_sharing flag in VADriverVTableWayland to indicate if buffer \ 
sharing with prime fd can
  be used in the backend driver

Version 1.7.2 - 05.Sep.2016
* Bump VA API version to 0.39.3
* API: add support for ROI
* Add support for VP9 encoder in VA tracer
* Refine test cases
* Fix the issue of not properly terminating the parsed environment values with '\0'
  https://bugs.freedesktop.org/show_bug.cgi?id=96677

Version 1.7.1 - 21.Jun.2016
* Bump VA API version to 0.39.2
* API: add support for VP9 8bit encode
* API: add support for low power/high performance encode
* API: add support for encoding ROI attribute
* API: add support for macroblock based rate control
* Fix VA tracer to support multiple contexts in one instance

Version 1.7.0 - 15.Mar.2016
* Bump VA API version to 0.39
* Add support for VP9 10bit decode API
* Allow libva to load the vaapi driver provided by Mesa Gallium for nouveau and \ 
radeon
* Fix libva-glx against OpenGL 3.1 or above

Version 1.6.2 - 15.Dec.2015
* Bump VA API version to 0.38.1
* Add new RT format for 16 bits per channel memory layout(P010,P016): \ 
VA_RT_FORMAT_YUV420_10BPP
* Add new fourcc codes: VA_FOURCC_P010, VA_FOURCC_P016, VA_FOURCC_YV16
* Fix crash if user doesn't have right to access the DRI device
* Fix uninitialized x11_screen driver context member for X11 output
  https://bugs.freedesktop.org/show_bug.cgi?id=61603
* Fix the issue of not to use LIBVA_DRIVER_NAME
  https://bugs.freedesktop.org/show_bug.cgi?id=72822
* Fix build issue with wayland
  https://bugs.freedesktop.org/show_bug.cgi?id=79478
* vainfo: Add option '--display'

Version 1.6.1 - 09.Sep.2015
* Add support for VP9 decode and HEVC encode in VA trace module
* Add VP9 profile to vainfo
* Enhance VA trace to dump VP8 encode parameters

Version 1.6.0 - 01.Jul.2015
* Bump VA API version to 0.38
* Add support for HEVC encode API
* Add support for VP9 decode API
* Add API (vaSetDriverName()) to allow the user to specify the loaded backend driver
* Add VAConfigAttribEncSkipFrame and corresponding structures to support
  sending skip frame parameters to the backend driver.
* Add support for querying slice decoding mode supported by the backend driver
* Fix quality issue in the JPEG encode demo

Version 1.5.1 - DD.Mar.2015
* API: correct the comment for num_token_partitions in struct  \ 
_VAEncPictureParameterBufferVP8
* VA/x11: fix double Unlocks/SyncHandle to avoid segmentation fault

Version 1.5.0 - 28.Dec.2014
* API: add support for HEVC decoding
* API: extend JPEG encoding data structures and add configuration attribute for \ 
JPEG encoding
* Add a unit test for JPEG encoding (Sirisha Muppavarapu)
* Add support for HEVC decoding and JPEG encoding in VA trace utility
* Fix out of tree builds (Emil Velikov)
* VA/X11: fix BadDrawable issue when calling vaTerminate() after the pixmaps \ 
have been destroyed (Lionel Landwerlin)

Version 1.4.1 - 24.Oct.2014
* Add support for DRM Render-Nodes (Andrey Larionov)

Version 1.4.0 - 30.Sep.2014
* API: add support for VP8 encoding
* API: add H.264 MVC profiles for decoding and encoding
* API: add buffer export interfaces for interop with 3rdparty APIs (EGL, OCL)
* API: add suppor for encoder quality level
* API: add attribute usage hint flag
* Fix build on 64-bit versions of Android (Qiming Shi)
* Assorted fixes to the VA fool and trace modules (Austin Yuan)

Version 1.3.1 - 09.May.2014
* API: fix VA_ENC_PACKED_HEADER_RAW_DATA value
* API: add STE filter to the VPP pipeline
* Update doxygen tags in libva
* Fix doc/Makefile.am
* A workaround for https://bugs.freedesktop.org/show_bug.cgi?id=76755

Version 1.3.0 - 24.Mar.2014
* API: add support for VP8 decoding
* API: drop VAEntrypointMax enumeration
* Enhancement for VA trace utility

Version 1.2.1 - 27.Jun.2013
* Fix https://bugs.freedesktop.org/show_bug.cgi?id=66221
* Add back VA_DRIVER_INIT_FUNC definition for testing

Version 1.2.0 - 25.Jun.2013
* API: new H.264 encoding API for Main and High profiles
* API: add support for MPEG-2 encoding
* API: add video processing interfaces
* API: add vaQuerySurfaceAttributes() to query surface attributes supported by \ 
the underlying drivers.
* API: new version of vaCreateSurfaces()
* API: add new surface attributes to enable VA surface creation from external buffer
* API: add new RT formats and fourcc codes
* Refine VA trace utility
* Refine H.264 encoding test cases {avcenc, h264enc}
* A new test case for MPEG-2 encoding
* A lot of bug fixes

Version 1.1.1 - 19.Mar.2013
* Support wayland 1.0 protocol (Rob Bradford)
* Automake 1.13 fixups (Armin K)