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

test/input.output/file.streams/fstreams/fstream.assign/move_assign.pass.cpp

@@ -19,7 +19,7 @@
 
 int main()
 {
-#ifdef _LIBCPP_MOVE
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     {
         std::fstream fso("test.dat", std::ios_base::in | std::ios_base::out
                                                        | std::ios_base::trunc);
@@ -44,5 +44,5 @@ int main()
         assert(x == 3.25);
     }
     std::remove("test.dat");
-#endif  // _LIBCPP_MOVE
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 }