Isolated emscripten in new lib

lib/emscripten/emtests/test_conststructs.c

@@ -0,0 +1,25 @@
+/*
+ * 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>
+struct IUB {
+  int c;
+  double p;
+  unsigned int pi;
+};
+
+int main(int argc, const char *argv[]) {
+  int before = 70;
+  IUB iub[] = {{'a', 0.3029549426680, 5},
+               {'c', 0.15, 4},
+               {'g', 0.12, 3},
+               {'t', 0.27, 2}, };
+  int after = 90;
+  printf("*%d,%d,%d,%d,%d,%d*\n", before, iub[0].c, int(iub[1].p * 100),
+         iub[2].pi, int(iub[0].p * 10000), after);
+  return 0;
+}