Merge pull request #1902 from livecodeian/feature-emscripten-module

[[ Emscripten ]] Add com.livecode.emscripten to list of builtin extensions

Author: livecodeali

Toolset/libraries/revideextensionlibrary.livecodescript

@@ -873,6 +873,7 @@ private function __extensionIsBuiltin pID
       case "com.livecode.typeconvert"
       case "com.livecode.extensions.libbrowser"
       case "com.livecode.java"
+      case "com.livecode.emscripten"
       case "com.livecode.objc"
       case "com.livecode.commercial.license"
          return true