[build] Makefile examples modularization

Now examples can be compiled by module, that's useful when compilation fails at some point

examples/text/text_font_spritefont.c

@@ -78,7 +78,7 @@ int main(void)
     UnloadFont(font2);      // Font unloading
     UnloadFont(font3);      // Font unloading
 
-    CloseWindow();                // Close window and OpenGL context
+    CloseWindow();          // Close window and OpenGL context
     //--------------------------------------------------------------------------------------
 
     return 0;