[libcxx] Reinstate <string.h> and fix overload sets to be const-correct wherever possible

[Marshall Clow via cfe-commits]

>
> On Tue, Dec 8, 2015 at 3:52 PM, Richard Smith <richard at metafoo.co.uk>
> wrote:
>
>> Ping.
>>
>
Sorry about that.
Completely missed this in my email flood.

This approach looks ok to me, but I wonder if it would be better to get
Apple to fix their iOS C library instead.

Are there other broken C libraries that we are concerned with?

-- Marshall
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