Changed __config to react to all of clang's currently documented has_feature flags, and renamed _LIBCPP_MOVE to _LIBCPP_HAS_NO_RVALUE_REFERENCES to be more consistent with the rest of the libc++'s flags, and with clang's nomenclature.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@113086 91177308-0d34-0410-b5e6-96231b3b80d8

include/__mutex_base

@@ -115,7 +115,7 @@ private:
     unique_lock& operator=(unique_lock const&); // = delete;
 
 public:
-#ifdef _LIBCPP_MOVE
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     unique_lock(unique_lock&& __u)
         : __m_(__u.__m_), __owns_(__u.__owns_)
         {__u.__m_ = nullptr; __u.__owns_ = false;}
@@ -129,7 +129,7 @@ public:
             __u.__owns_ = false;
             return *this;
         }
-#endif  // _LIBCPP_MOVE
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
     void lock();
     bool try_lock();