Qt multimedia ffmpeg changes may break the backend

[atauzki]

On qt 6.7.0 for windows platform, the ffmpeg backed is dynamically linked to ffmpeg, 6.4-6.6 is statically instead. Although the ffmpeg dlls are included in official binaries, windeployqt doesn't install them.

The list of dlls are:
avcodecs-60.dll
avformat-60.dll
avutil-58.dll
swresample-4.dll
swscale-7.dll

That means we should install them manually before windeployqt handle them correctly.

[xiaoyifang]

On windows , I would recommend to disable build against ffmpeg ,

CONFIG+=no_ffmpeg_player

[atauzki]

On windows , I would recommend to disable build against ffmpeg ,

CONFIG+=no_ffmpeg_player

No, not that case. It's qt's multimedia backend. Maybe I'll take another screenshort to show this change.

[atauzki]

if the dll are missing the ffmpeg backend won't be loaded and no sound with gdau:// will be played.

and we can just use their binaries.

[xiaoyifang]

windeployqt doesn't install them.

I believe this is an another windeployqt's bug.

[xiaoyifang]

if the dll are missing the ffmpeg backend won't be loaded and no sound

https://github.com/xiaoyifang/goldendict-ng/blob/staged/.github/scripts/windows-publish.ps1

need to be changed to remedy this change of qt version.

[atauzki]

Sorry for the wrong place in the commit. the plugins in target path should be removed.