Apply HEVC patch on n5.0 or greater, and master

[AnimMouse]

Fixes:
#603
AnimMouse/ffmpeg-stable-autobuild#70

[tokawa-ms]

Description of SVT-HEVC Patch document says the following.
https://github.com/OpenVisualCloud/SVT-HEVC/tree/master/ffmpeg_plugin

If the above patch failed when you work on master branch or newer version of FFmpeg,
please try the patch for master branch: master-0001-lavc-svt_hevc-add-libsvt-hevc-encoder-wrapper.patch

This SVT-HEVC patch should be applied to FFmpeg n5.0 and newer versions and master branch in order to follow the SVT-HEVC patch documentation.
But @AnimMouse 's code may apply its patch on n4.1 or lower, n5.0 or grater, and master branch.

So this code block must check $ffmpeg_git_checkout_version is not n4.1 or lower, and $ffmpeg_git_checkout_version is master or n5.0 or newer, I think.
The expected patch behavior for each version is summarized below.

$ffmpeg_git_checkout_version	patch
<=n4.1	not apply
n4.2,n4.3,n4.4	git apply "$work_dir/SVT-HEVC_git/ffmpeg_plugin/n4.4-0001-lavc-svt_hevc-add-libsvt-hevc-encoder-wrapper.patch" git apply "$patch_dir/SVT-HEVC-0002-doc-Add-libsvt_hevc-encoder-docs.patch"
master	git apply "$work_dir/SVT-HEVC_git/ffmpeg_plugin/master-0001-lavc-svt_hevc-add-libsvt-hevc-encoder-wrapper.patch"
>=n5.0	git apply "$work_dir/SVT-HEVC_git/ffmpeg_plugin/master-0001-lavc-svt_hevc-add-libsvt-hevc-encoder-wrapper.patch"

[AnimMouse]

@tokawa-ms Thanks! I have now committed a code block not to apply patch when below n4.1 and only those releases that is still maintained.