fix emscripten dependencies by making separate test crate

lib/emscripten-tests/emtests/test_exceptions_simplify_cfg.cpp

@@ -0,0 +1,41 @@
+// Copyright 2016 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+/**
+ * This is the main test runner file for tests
+ */
+#include <iostream>
+#include <stdio.h>
+
+struct Before {
+  bool allow() { return true; }
+
+  std::string m_assertionInfo;
+};
+
+void do_throw2() {
+  printf("- Throwing\n");
+  throw std::runtime_error("runtime_error() thrown");
+}
+
+void runtest() {
+  printf("- Run test\n");
+  Before bef;
+  if ( bef.allow() ) {
+    try {
+      do_throw2();
+    }
+    catch( std::runtime_error ) {
+      printf("- Caught expected\n"); 
+    }
+  }
+  else { printf("- not allowed\n"); }
+
+}
+
+int main( int argc, char* argv[] ) {
+  runtest();
+}
+