Add: allow using SDL2 in "relative mouse mode" #8360
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This mode doesn't wrap the mouse constantly, but requests SDL / OS
to lock the mouse pointer. This solves mouse problems on a few
OSes, like GUI Linux via WSL2, where the X11-server is not allowed
to change the mouse position in Windows (as it isn't capturing it).
This also is needed for other OSes that by design can never
capture the mouse, like with Emscripten, as it runs in a browser.
You can enable this moude via "-vsdl:relative_mode".