Disable the Android CloseGuard by default. Android disables this too …

…early on

at startup. We now disable it by default. It can still be enabled by users who
need it. (fixes #466)

rt/libcore/dalvik/src/main/java/dalvik/system/CloseGuard.java

@@ -113,8 +113,9 @@ public final class CloseGuard {
      * Enabled by default so we can catch issues early in VM startup.
      * Note, however, that Android disables this early in its startup,
      * but enables it with DropBoxing for system apps on debug builds.
+     * <p>RoboVM note: Changed to be disabled by default.
      */
-    private static volatile boolean ENABLED = true;
+    private static volatile boolean ENABLED = false;
 
     /**
      * Hook for customizing how CloseGuard issues are reported.