re PR c++/689 ([diagnostic] this warning is not helpful: `class xxxx' only defines a private destructor and has no friend)
PR C++/689
PR C++/9257
* c-opts.c (c_common_decode_option): Don't set
warn_ctor_dtor_privacy wen -Wall.
* c-common.c (warn_ctor_dtor_privacy): Don't turn on by default.
From-SVN: r66684
