Make gnu++11 the default standard version.

There are a _lot_ of users of `typeof` in the tree, and they'll need a
GNU flavored standard. Rather than fixing up all of these
individually, let's just use gnu++11 as the default.

Bug: 18466763
Change-Id: Ia1bd3adaa74fadba259fda3d37653fb8d5cff69a
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 3e5d199..52a1b1f 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -310,6 +310,11 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/root/default.prop)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/recovery/root/default.prop)
 
+# Make GNU++11 the default standard version. This requires a cleanspec because
+# char16_t/char32_t will be real types now instead of typedefs, which means
+# an ABI change since the names will mangle differently.
+$(call add-clean-step, rm -rf $(OUT_DIR))
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************