Protect __shared_weak_count::__get_deleter declaration with _LIBCPP_NO_RTTI.  Fixes http://llvm.org/bugs/show_bug.cgi?id=12867

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@157049 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed