Split parts of bits/socket.h to bits/sockettypes.h

[David Miller]

From: Roland McGrath <roland@hack.frob.com>
Date: Thu,  8 Mar 2012 23:57:42 -0800 (PST)

> If it's going to contain nothing but enum __socket_type, then I'd prefer
> the name <bits/socket_type.h> (and the comment above the inclusion should
> make it more explicit that enum __socket_type is what it defines).
> sockettypes sounds like something that declares all the (C) types related
> to sockets.  Also, always make the top comment line of every new file a
> descriptive line rather than being the copyright line.
> 
> Otherwise fine by me, though I think Dave should both agree and test it on
> sparc before it goes in.

I'm fine with it and I'll test it as soon as he posts a new version
incorporating your feedback.