Remove support for wasm build

Remove support for wasm build

Author: tharun571

src/xinterpreter.cpp

@@ -407,6 +407,8 @@ __get_cxx_version ()
         // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("file", writefile());
         // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("timeit", timeit(&m_interpreter));
         // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("python", pythonexec());
+#ifndef EMSCRIPTEN
         preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("xassist", xassist());
+#endif
     }
 }