Compatibility layer to transition from UniquePtr to std::unique_ptr.

Use ART_WITH_STLPORT (enabled for the target) to cause the use of UniquePtr,
for the host switch to std::unique_ptr. For now the type remains called
UniquePtr.
Make dalvik compile with clang on the host, move its build to C++11.

Change-Id: I5ba8d2757904bc089ed62047ea03de3c0853fb12
diff --git a/runtime/common_runtime_test.h b/runtime/common_runtime_test.h
index 79d3690..d7a1667 100644
--- a/runtime/common_runtime_test.h
+++ b/runtime/common_runtime_test.h
@@ -47,7 +47,7 @@
 #include "ScopedLocalRef.h"
 #include "thread.h"
 #include "utils.h"
-#include "UniquePtr.h"
+#include "UniquePtrCompat.h"
 #include "verifier/method_verifier.h"
 #include "verifier/method_verifier-inl.h"
 #include "well_known_classes.h"