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Thus removing the preprocessor's directives to included if found.

CodecProfile will be set in MFXVideoDECODE_DecodeHeader() to match
the input stream. Setting the hard-coded profile here will mislead
user that msdkh265dec supports a special profile only.

Now hevc 10bit video can be decoded correctly, so update the sink
and src caps accordingly.

This fixes #720

We will add more formats in the src caps of msdkh265dec, so let
msdkh265dec uses separate src caps. Note it doesn't change any
capability

Since output-order is a deprecated attribute, move it out of decode
bass class and configure it in each sub decoder class who need it.

https://bugzilla.gnome.org/show_bug.cgi?id=796853

Building against mfx_dispatcher is used to search for
headers in PREFIX/include/mfx/ only (commit: 62f04e80),
but it is just PREFIX/include with open source msdk version.

https://bugzilla.gnome.org/show_bug.cgi?id=796118

Removes unessential field framerate for decoder so that negotiation
works even if framerate is not provided from upstream.

https://bugzilla.gnome.org/show_bug.cgi?id=789752

Makes GstMsdkContext to be a descendant of GstObject so that
we could track the life-cycle of the session of the driver.

Also replaces MsdkContext with this one.
Keeps msdk_d3d.c alive for the future.

https://bugzilla.gnome.org/show_bug.cgi?id=790752

E.g. from https://github.com/lu-zero/mfx_dispatch

https://bugzilla.gnome.org/show_bug.cgi?id=775726

The decoder only supports system memory output presently.

https://bugzilla.gnome.org/show_bug.cgi?id=774587

[scott.d.phillips@intel.com: gst-indent *.c *.h]
[scott.d.phillips@intel.com: link with libva at build time]
[scott.d.phillips@intel.com: remove unused includes]
[scott.d.phillips@intel.com: Update README]

https://bugzilla.gnome.org/show_bug.cgi?id=770990