GHA: Use the headers (not just the .libs) of the custom static SFML pack

That could dodge some of the breaking changes in SFML master, when building in the GHA.

[x] Currently failing:

Move the addon libs & includes to D:/a/Out_of_Nothing/Out_of_Nothing/tmp/SFML...
mv: can't rename 'include/*': No such file or directory
- ERROR: Failed to move content to 'D:/a/Out_of_Nothing/Out_of_Nothing/tmp/SFML/include/'! Aborting.

-> #512: Failed SFML setup should cancel the GHA!

xparq / Out_of_Nothing

GHA: Use the headers (not just the .libs) of the custom static SFML pack #511