Isolated emscripten in new lib

lib/emscripten/emtests/test_array2.c

@@ -0,0 +1,20 @@
+/*
+ * 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>
+
+static const double grid[4][2] = {{-3 / 3., -1 / 3.},
+                                  {+1 / 3., -3 / 3.},
+                                  {-1 / 3., +3 / 3.},
+                                  {+3 / 3., +1 / 3.}};
+
+int main() {
+  for (int i = 0; i < 4; i++)
+    printf("%d:%.2f,%.2f ", i, grid[i][0], grid[i][1]);
+  printf("\n");
+  return 0;
+}