PR feedback, comply with C standards

src/raylib.h

@@ -1220,8 +1220,8 @@ RLAPI void UpdateCameraPro(Camera *camera, Vector3 movement, Vector3 rotation, f
 // NOTE: It can be useful when using basic shapes and one single font,
 // defining a font char white rectangle would allow drawing everything in a single draw call
 RLAPI void SetShapesTexture(Texture2D texture, Rectangle source);       // Set texture and rectangle to be used on shapes drawing
-RLAPI Texture2D GetShapesTexture();                                     // Get texture that is used for shapes drawing
-RLAPI Rectangle GetShapesTextureRectangle();                            // Get texture source rectangle that is used for shapes drawing
+RLAPI Texture2D GetShapesTexture(void);                                 // Get texture that is used for shapes drawing
+RLAPI Rectangle GetShapesTextureRectangle(void);                        // Get texture source rectangle that is used for shapes drawing
 
 // Basic shapes drawing functions
 RLAPI void DrawPixel(int posX, int posY, Color color);                                                   // Draw a pixel

src/rshapes.c

@@ -113,13 +113,14 @@ void SetShapesTexture(Texture2D texture, Rectangle source)
 }
 
 // Get texture that is used for shapes drawing
-Texture2D GetShapesTexture()
+Texture2D GetShapesTexture(void)
 {
     return texShapes;
 }
 
 // Get texture source rectangle that is used for shapes drawing
-Rectangle GetShapesTextureRectangle()
+Rectangle GetShapesTextureRectangle(void)
+Rectangle GetShapesTextureRectangle(void)
 {
     return texShapesRec;
 }