updae source to 2.0.9 source

Edward Rudd

2019-04-09 9cd2e9ec8fc0127393dfce9c0359d500c8c238be

 source/src/core/linux/SDL_evdev.c

@@ -101,6 +101,7 @@
    SDL_EVDEV_keyboard_state *kbd;
} SDL_EVDEV_PrivateData;

#undef _THIS
#define _THIS SDL_EVDEV_PrivateData *_this
static _THIS = NULL;