[PATCH] drop old netinet/in_systm.h include

[Damien Miller]

On Tue, 11 Dec 2018, Mike Frysinger wrote:

> This header provides only three typedefs: n_long, n_short, and n_time.
> OpenSSH doesn't use it at all, and the headers it includes don't.  So
> punt this ancient include since it offers nothing useful.

IIRC this was needed on some systems because other sys/* headers depended
on its definitions. 

No idea if that's still the case though