Fix file preloading warning in HTML5 platform

platform/javascript/detect.py

@@ -129,10 +129,6 @@ def configure(env):
     # us since we don't know requirements at compile-time.
     env.Append(LINKFLAGS=['-s', 'ALLOW_MEMORY_GROWTH=1'])
 
-    # Since we use both memory growth and MEMFS preloading,
-    # this avoids unnecessary copying on start-up.
-    env.Append(LINKFLAGS=['--no-heap-copy'])
-
     # This setting just makes WebGL 2 APIs available, it does NOT disable WebGL 1.
     env.Append(LINKFLAGS=['-s', 'USE_WEBGL2=1'])
 

platform/javascript/engine.js

@@ -199,7 +199,8 @@
 					}
 					LIBS.FS.mkdirTree(dir);
 				}
-				LIBS.FS.createDataFile('/', file.path, new Uint8Array(file.buffer), true, true, true);
+				// With memory growth, canOwn should be false.
+				LIBS.FS.createDataFile(file.path, null, new Uint8Array(file.buffer), true, true, false);
 			}, this);
 
 			preloadedFiles = null;