Isolated emscripten in new lib

lib/emscripten/emtests/test_sscanf_float.c

@@ -0,0 +1,17 @@
+/*
+ * 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"
+
+int main() {
+  float f1, f2, f3, f4, f5, f6, f7, f8, f9;
+  sscanf("0.512 0.250x5.129_-9.98 1.12*+54.32E3 +54.32E3^87.5E-3 87.5E-3$",
+         "%f %fx%f_%f %f*%f %f^%f %f$", &f1, &f2, &f3, &f4, &f5, &f6, &f7, &f8,
+         &f9);
+  printf("\n%f, %f, %f, %f, %f, %f, %f, %f, %f\n", f1, f2, f3, f4, f5, f6, f7,
+         f8, f9);
+}