[FFmpeg-devel] [PATCH v2] Long path support for Windows (fixes #8885)

[nil-admirari at mailo.com]

ANSI functions do not support long paths, so I had to change
LoadLibraryExA to LoadLibraryExW.in compat/w32dlfcn.h as well.

I cannot find other uses of WinAPI functions ending with ..A(.
Looks like FFmpeg doesn't use ANSI functions anywhere else,
but the codebase is huge, so who knows.

Previous patch generated a warning: The first line of the commit message must start with a context...: https://patchwork.ffmpeg.org/project/ffmpeg/patch/20220214095146.13432-1-nil-admirari@mailo.com/.
Patch affected multiple files, so in order to specify the context the patch had to be split into pieces.

A new version of the patch is at https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293106.html.