x11: Fixed incorrect function signature for XkbSetDetectableAutoRepeat.

It needs to use Bool (which is an int) and not BOOL (which is CARD8), which
causes problems on platforms with different byte order and alignment, etc.

Fixes Bugzilla #4326.

src/video/x11/SDL_x11keyboard.c

@@ -266,7 +266,7 @@ X11_InitKeyboard(_THIS)
     int best_distance;
     int best_index;
     int distance;
-    BOOL xkb_repeat = 0;
+    Bool xkb_repeat = 0;
     
     X11_XAutoRepeatOn(data->display);
 

src/video/x11/SDL_x11sym.h

@@ -180,7 +180,7 @@ SDL_X11_SYM(Status,XkbGetUpdatedMap,(Display* a,unsigned int b,XkbDescPtr c),(a,
 SDL_X11_SYM(XkbDescPtr,XkbGetMap,(Display* a,unsigned int b,unsigned int c),(a,b,c),return)
 SDL_X11_SYM(void,XkbFreeClientMap,(XkbDescPtr a,unsigned int b, Bool c),(a,b,c),)
 SDL_X11_SYM(void,XkbFreeKeyboard,(XkbDescPtr a,unsigned int b, Bool c),(a,b,c),)
-SDL_X11_SYM(BOOL,XkbSetDetectableAutoRepeat,(Display* a, BOOL b, BOOL* c),(a,b,c),return)
+SDL_X11_SYM(Bool,XkbSetDetectableAutoRepeat,(Display* a, Bool b, Bool* c),(a,b,c),return)
 #endif
 
 #if NeedWidePrototypes