Build fix

Author: timothyschoen

build.py

@@ -117,8 +117,10 @@
             src = os.path.join(format_path, plugin_filename);
             dst = os.path.join(target_dir, plugin_filename);
             if os.path.isdir(src):
-                shutil.rmtree(dst)
+                if os.path.exists(dst):
+                    shutil.rmtree(dst)
                 shutil.copytree(src, dst)
             else:
-                os.remove(dst)
+                if os.path.exists(dst):
+                    os.remove(dst)
                 shutil.copy2(src, dst)