Some of the synopsis was left out of these headers, and the copy construction/assignment should have been marked as deleted. Done. No functionality change, because the base class (base_ios) was marked as non-copyable already.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@217876 91177308-0d34-0410-b5e6-96231b3b80d8