This fixes file_packager.py when used out of emcc, since LZ4 is no
longer in the namespace

--- a/emsdk/fastcomp/emscripten/tools/file_packager.py
+++ b/emsdk/fastcomp/emscripten/tools/file_packager.py
@@ -530,8 +530,8 @@
     use_data = '''
           var compressedData = %s;
           compressedData.data = byteArray;
-          assert(typeof LZ4 === 'object', 'LZ4 not present - was your app build with  -s LZ4=1  ?');
-          LZ4.loadPackage({ 'metadata': metadata, 'compressedData': compressedData });
+          assert(typeof Module.LZ4 === 'object', 'LZ4 not present - was your app build with  -s LZ4=1  ?');
+          Module.LZ4.loadPackage({ 'metadata': metadata, 'compressedData': compressedData });
           Module['removeRunDependency']('datafile_%s');
     ''' % (meta, shared.JS.escape_for_js_string(data_target))