Stdc compatiability

I tried cross compiling stdlibc++-V3 e01d6e179 and I faced some issues, with this patch (and still some modificaiton that are not related to relibc at all to stdlibc++) I managed to get stdlibc++ to compile on x86_64-*-linux-relibc.

When I was in doubt on how to do things, I checked glibc, musl, and uclibc-ng. This patch set makes a huge assumption, that is relibc shall only work on 64 bit machines, that assumption is convenient at the time being as it cuts down huge complexities but it isn't portable to architectures with different word width.