SDL_Joystick type is not named after its struct

[tom-seddon]

See

SDL/include/SDL3/SDL_joystick.h

Line 73 in 3ebfb15

struct _SDL_Joystick;

This is hardly the end of the world, but it makes forward declaration more annoying, and use of the forward-declared type (particularly in C++) is then inconsistent.

Compare and contrast with, say, SDL_Window, which you can just forward declare using the name you'd use normally: https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_video.h#L95

(SDL_GameController, aka struct _SDL_GameController, suffers from the same problem.)

Thanks,

--Tom

P.S. identifiers that begin with an underscore and an uppercase letter are reserved by the standard. Feels like the chance of standard identifiers beginning with _SDL_ is low, but stranger things have happened