Isolated emscripten in new lib

lib/emscripten/emtests/test_funcptrfunc.c

@@ -0,0 +1,19 @@
+/*
+ * 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.
+ */
+
+#include <stdio.h>
+
+typedef void (*funcptr)(int, int);
+typedef funcptr (*funcptrfunc)(int);
+
+funcptr __attribute__((noinline)) getIt(int x) { return (funcptr)x; }
+
+int main(int argc, char **argv) {
+  funcptrfunc fpf = argc < 100 ? getIt : NULL;
+  printf("*%p*\n", fpf(argc));
+  return 0;
+}