Include netinet/in_systm.h in lm-sock.c, fixes LM-130.
Added check for netinet/in_systm.h and include it in lm-sock.c if it exists. It
fixes a build error on BSD.
Mikael Hallendal <micke@imendio.com>Dafydd Harries <dafydd.harries@collabora.co.uk>Senko Rasic <senko.rasic@collabora.co.uk>