[patch libstdc++] Fix assignability check in uninitialized_copy

[Eelis]

std::uninitialized_copy tries to test assignability as follows:

      is_assignable<_ValueType1, _RefType>::value

This is the wrong way around. For example, when the iterators are char*, this ends up as

      is_assignable<char, char&>::value

which is false. It should be

      is_assignable<char&, char>::value

which is true.

The result is that uninitialized_copy needlessly picks the slow implementation.

Trivial fix attached. (No tests ran because I'm getting "runtest: command not found" errors that I don't know how to fix.)

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