C++ PATCH for c++/50500 (DR 1082, implicitly declared copy in class with move)

[Jason Merrill]

DR 1082 changed the rules for implicitly declared copy constructors and 
assignment operators in the presence of move ctor/op= such that if 
either move operation is present, instead of being suppressed the copy 
operations will still be declared, but as deleted.

I had to add an explicit declaration of the copy ops to shared_ptr as a 
result; Benjamin, do the library changes look right?

Tested x86_64-pc-linux-gnu, applying to trunk.
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