Seems Apple's Clang has C++11 fully working rvalue references only with libc++

Change-Id: Iad3f984722be648a64490976933e9b2c2b950bdc

boost/UnpackedTarball_boost.mk

@@ -40,6 +40,7 @@ boost_patches += boost_1_44_0-gcc4.8.patch
 boost_patches += boost.4874.patch
 
 boost_patches += boost.loplugin.patch
+boost_patches += boost.std.move.patch
 boost_patches += boost.wundef.patch
 boost_patches += boost.wshadow.patch
 

boost/boost.std.move.patch

+--- foo/foo/foo/boost/config/compiler/clang.hpp
++++ foo/foo/foo/boost/config/compiler/clang.hpp
+@@ -8,6 +8,8 @@
+ 
+ // Clang compiler setup.
+ 
++#include <utility>
++
+ #if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS)
+ #  define BOOST_NO_EXCEPTIONS
+ #endif
+@@ -108,7 +108,7 @@
+ #  define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
+ #endif
+ 
+-#if !__has_feature(cxx_rvalue_references)
++#if !__has_feature(cxx_rvalue_references) || (defined(__APPLE__) && !defined(_LIBCPP_VERSION))
+ #  define BOOST_NO_CXX11_RVALUE_REFERENCES
+ #endif
+