in BSD variants and the family member is also an unsigned char instead
of (unsigned) short. So we define HAVE_SA_LEN for those BDS variants
and check for the offsetof for the sa_family member and also change
the struct qsockaddr to mirror that. This should matter only when
PLATFORM_UNIX is defined.
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@260 af15c1b1-3010-417e-b628-4374ebc0bcbd