add vaapi support

[AkashiSN]

• add AMF support
• add vaapi support
• With the addition of vaapi support, Python3 is now required for Linux.
• Downloading failed on some sources, so we changed the download destination to GitHub or GitLab.
• I added autotools because I needed them for that.

Best regards.

[AkashiSN]

I found a case where it doesn't work properly with vaapi, so I'll revert to the draft until it's fixed.

[markus-perl]

Vaapi has a few odd dependencies like python and I have no AMD graphics card to fully test the final build. That's why I haven't integrated it yet. But if all checks pass and the build works on your machine, I see no problems merging the changes into the script.

[AkashiSN]

To be precise, Python is required because meson, the build tool for building libdrm, a dependency of vaapi's library, libva, is written in Python. So, if you have a policy of enabling vaapi when libdrm is present in the environment you are building, you will not have a Python dependency.
I don't have an AMD graphics card either, so I can't do a full test. I'll be removing support for AMF for this PR.
I am currently testing and modifying vaapi on actual machines and will open the PR again as soon as we finish.

[AkashiSN]

Thank you very much fix my terrible English , and merge it. 🙏

[markus-perl]

No Problem and thanks for all the work and time you've spent on this topic!