Removed some function declarations that don't actually exist.

Reference Issue #8554.

(cherry picked from commit 87875a49b4)

src/video/kmsdrm/SDL_kmsdrmevents.h

@@ -25,7 +25,5 @@
 #define SDL_kmsdrmevents_h_
 
 extern void KMSDRM_PumpEvents(SDL_VideoDevice *_this);
-extern void KMSDRM_EventInit(SDL_VideoDevice *_this);
-extern void KMSDRM_EventQuit(SDL_VideoDevice *_this);
 
 #endif /* SDL_kmsdrmevents_h_ */

src/video/raspberry/SDL_rpievents_c.h

@@ -25,7 +25,5 @@
 #include "SDL_rpivideo.h"
 
 void RPI_PumpEvents(SDL_VideoDevice *_this);
-void RPI_EventInit(SDL_VideoDevice *_this);
-void RPI_EventQuit(SDL_VideoDevice *_this);
 
 #endif /* SDL_rpievents_c_h_ */