[v3] PATCH to add non-const deleted thread copy constructor

[Jason Merrill]

We've previously discussed using SFINAE to prevent an ill-formed attempt 
to copy a thread from matching the variadic constructor, but a simpler 
solution is just to declare the non-const copy ctor as well as the usual 
const variant.

Tested x86_64-pc-linux-gnu, approved by bkoz, applied to trunk.
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