[klibc] [patch] import socket defines

[H. Peter Anvin]

Mike Frysinger wrote:
> The kernel __GLIBC__ hacks were re-added so as to appease klibc people, but
> the klibc people didnt actually fix the problem on their side.  This patch
> imports the structures/defines that klibc seems to need.  Build tested on
> x86_64 (i dont actually use klibc so no idea how to test it).

The whole point was to NOT need to replicate all these structures and 
constants, which are part of the ABI, in klibc...

	-hpa