added RuntimePermission and System.getenv()

classpath/java/lang/RuntimePermission.java

@@ -0,0 +1,21 @@
+/* Copyright (c) 2012, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.lang;
+
+import java.security.BasicPermission;
+
+public class RuntimePermission extends BasicPermission {
+
+  public RuntimePermission(String name) {
+    super(name);
+  }
+
+}