[v3] use alias-declaration to complete allocator and pointer traits

[Jonathan Wakely]

The new alias-declaration support in trunk allows the
std::pointer_traits and std::allocator_traits implementations to be
finished, by replacing the __rebind::__type workarounds with the
required alias-declarations.

        * include/bits/ptr_traits.h (__rebind): Replace with...
        (rebind): Implement using alias-declaration.
        * include/ext/pointer.h (__rebind): Replace with...
        (rebind): Implement using alias-declaration.
        * include/bits/alloc_traits.h (__rebind_alloc, __rebind_traits):
        Replace with...
        (rebind_alloc, rebind_traits): Implement using alias-declaration.
        * include/ext/alloc_traits.h (rebind): Use rebind_alloc instead of
        __rebind_alloc.
        * include/std/scoped_allocator (rebind): Likewise.

Tested x86_64-linux and x86_64-netbsd, committed to trunk.
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