std: add IP, IPV6, IPTOS sockopt constants

Because these lists are very long in several cases and quite
varied, I opted to place them in the existing c/foo.zig files.

There are many other sets of network-related constants like this
to add over time across all the OSes.  For now I picked these
because I needed a few constants from each of these namespaces for
my own project, so I tried to flesh out these namespaces
completely as best I could, at least for basic sockopt purposes.

Note windows has some of these already defined in ws2_32 as
individual constants rather than contained in a namespacing
struct.  I'm not sure what to do with that in the long run (break
it and namespace them?), but this doesn't change the status quo
for windows in any case.

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