[patch] libstdc++/65279 fix scoped_allocator_adaptor assignment

[Jonathan Wakely]

std::scoped_allocator_adaptor declares a move constructor but not a
copy assignment operator, which means the copy assignment operator is
defined as deleted, and so scoped_allocator_adaptor<A...> is not
CopyAssignable. (This seems to be exactly what the standard requires,
but that's clearly a defect in the standard and I've reported it).

This is a regression on all branches since 4.7 (because 4.7 didn't
implement the final rules about deleting the copy assignment).

Tested x86_64-linux, committed to trunk so far, with backports for 4.8
and 4.9 to follow.

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