Fix warning for Android NDK compiler: "function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]"

https://stackoverflow.com/questions/42125/warning-error-function-declaration-isnt-a-prototype
In C int foo() and int foo(void) are different functions. int foo() accepts an arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing.

src/video/android/SDL_androidmouse.c

@@ -74,7 +74,7 @@ static SDL_Cursor *Android_WrapCursor(int custom_cursor, int system_cursor)
     return cursor;
 }
 
-static SDL_Cursor *Android_CreateDefaultCursor()
+static SDL_Cursor *Android_CreateDefaultCursor(void)
 {
     return Android_WrapCursor(0, SDL_SYSTEM_CURSOR_DEFAULT);
 }
@@ -112,7 +112,7 @@ static void Android_FreeCursor(SDL_Cursor *cursor)
     SDL_free(cursor);
 }
 
-static SDL_Cursor *Android_CreateEmptyCursor()
+static SDL_Cursor *Android_CreateEmptyCursor(void)
 {
     if (!empty_cursor) {
         SDL_Surface *empty_surface = SDL_CreateSurface(1, 1, SDL_PIXELFORMAT_ARGB8888);
@@ -125,7 +125,7 @@ static SDL_Cursor *Android_CreateEmptyCursor()
     return empty_cursor;
 }
 
-static void Android_DestroyEmptyCursor()
+static void Android_DestroyEmptyCursor(void)
 {
     if (empty_cursor) {
         Android_FreeCursor(empty_cursor);