kc3-lang/SDL

2022-12-17T06:51:02

Fixed compiler warning ``` ./src/joystick/SDL_joystick.c:105:12: warning: no previous extern declaration for non-static variable 'SDL_joystick_lock' [-Wmissing-variable-declarations] SDL_mutex *SDL_joystick_lock = NULL; /* This needs to support recursive locks */ ^ ./src/joystick/SDL_joystick.c:105:1: note: declare 'static' if the variable is not intended to be used outside of this translation unit SDL_mutex *SDL_joystick_lock = NULL; /* This needs to support recursive locks */ ^ ``` 1 warning generated.