Merge pull request #747 from buu700/master

iOS fix

dist-build/emscripten.sh

@@ -108,12 +108,16 @@ if [ "$DIST" = yes ]; then
           reject(err);
         }
       };
-      $(cat "${PREFIX}/lib/libsodium.wasm.tmp.js")
-    }).catch(function () {
+      Module.useBackupModule = function () {
         var Module = _Module;
         Module.onAbort = undefined;
         Module.onRuntimeInitialized = undefined;
+        Module.useBackupModule = undefined;
         $(cat "${PREFIX}/lib/libsodium.asm.tmp.js" | sed 's|use asm||g')
+      };
+      $(cat "${PREFIX}/lib/libsodium.wasm.tmp.js")
+    }).catch(function () {
+      _Module.useBackupModule();
     });
 EOM