Try to remove confusion about C++11 feature support:
 * Explicitly say that we conform to the two N/A bullets that required no
   compiler changes.
 * Remove a library feature from our features list.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@203964 91177308-0d34-0410-b5e6-96231b3b80d8