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.

Xcode-iOS/Demos/src/fireworks.c

@@ -52,9 +52,9 @@ void spawnTrailFromEmitter(struct particle *emitter);
 void spawnEmitterParticle(GLfloat x, GLfloat y);
 void explodeEmitter(struct particle *emitter);
 void initializeParticles(void);
-void initializeTexture();
+void initializeTexture(void);
 int nextPowerOfTwo(int x);
-void drawParticles();
+void drawParticles(void);
 void stepParticles(double deltaTime);
 
 /*  helper function (used in texture loading)
@@ -159,7 +159,7 @@ stepParticles(double deltaTime)
     This draws all the particles shown on screen
 */
 void
-drawParticles()
+drawParticles(void)
 {
 
     /* draw the background */
@@ -324,7 +324,7 @@ initializeParticles(void)
     loads the particle texture
  */
 void
-initializeTexture()
+initializeTexture(void)
 {
 
     int bpp;                    /* texture bits per pixel */

Xcode-iOS/Demos/src/keyboard.c

@@ -196,7 +196,7 @@ loadFont(void)
 }
 
 void
-draw()
+draw(void)
 {
     SDL_SetRenderDrawColor(renderer, bg_color.r, bg_color.g, bg_color.b, bg_color.a);
     SDL_RenderClear(renderer);