d3d11h264dec: Add support for DXVA_Slice_H264_Long

DXVA_Slice_H264_Long is rarely used for modern hardware
but it's worth to support this configuration for legacy devices.
24 jobs for !1265 with d3d11-h264-refpiclist in 28 seconds (queued for 1 second)
latest detached
Status Job ID Name Coverage
  Preparation
passed #2713876
gst indent

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manual #2713875
manual
manifest
 
  Build
created #2713885
gstreamer
build cerbero cross-android universal
created #2713889
gst-ios-13.2
build cerbero cross-ios universal
created #2713886
gstreamer
build cerbero cross win32
created #2713887
gstreamer
build cerbero cross win64
created #2713884
gstreamer
build cerbero fedora x86_64
created #2713888
gst-macos-10.15
build cerbero macos x86_64
created #2713880
build clang fedora x86_64
created #2713883
1809 windows docker allowed to fail manual
build msys2
created #2713877
build nodebug fedora x86_64
created #2713878
build static fedora x86_64
created #2713879
build static nodebug fedora x86_64
created #2713881
1809 windows docker
build vs2017 amd64
created #2713882
1809 windows docker
build vs2017 x86
 
  Test
created #2713890
gstreamer
check fedora
created #2713891
gstreamer
integration testsuites fedora 1/4
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gstreamer
integration testsuites fedora 2/4
created #2713893
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integration testsuites fedora 3/4
created #2713894
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integration testsuites fedora 4/4
created #2713895
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valgrind bad
 
  Integrate
created #2713896
cross-android universal examples
created #2713898
gst-ios-13.2
cross-ios universal examples
created #2713897
documentation