Update sdlhints.inc to 2.0.22

[suve]

This patch updates sdlhints.inc to match SDL_hints.h, as of version 2.0.22, with one minor difference: in SDL 2.0.10, SDL_HINT_ANDROID_SEPARATE_MOUSE_AND_TOUCH has been removed completely. Instead of removing it, this patch marks it as deprecated.

An additional bugfix was made to the definition of TSDL_HintCallback - for SDL to be able to pass arguments to the function correctly, it should use the C calling convention.

[Free-Pascal-meets-SDL-Website]

Thanks, great work!

Could you update the version tag in sdl2.pas?

Then this is ready for merge. :-)

As a sidenote about the deprecate-marking: I wonder if Delphi isn't supporting the deprecated syntax, too.
From this https://docwiki.embarcadero.com/RADStudio/Alexandria/en/Declarations_and_Statements_(Delphi) I think it is but not sure if the syntax is exactly the same. So for now, it is fine as it is.

[suve]

Does Embarcadero have some trial versions of Delphi? If deprecated is supported by Delphi, then we could get rid of {$IFDEF FPC}. We could then review other files for deprecated functionality and mark it as such (which would also solve issue #34).

[Free-Pascal-meets-SDL-Website]

I made further research on this. I think it is safe to remove the conditional.

See https://stackoverflow.com/questions/27296111/is-possible-to-mark-an-entire-const-block-as-deprecated for reference. There are variables shown to be deprecated in an identical way for Delphi.

[Free-Pascal-meets-SDL-Website]

Thanks again! I made two minor changes before merge: I updated the deprecated modifier according to our discussion and the version tag in sdl2.pas.

Best regards