- do not try to set the quake hostname to the machine name if it isn't set.
- use the newly added unix/windows socket api compatibility macros from
net_sys.h: using just an int as the socketfd wasn't a problem without win64
support: the windows SOCKET type is not only unsigned but may actually be
wider (uintptr_t, which is 8 bytes on win64).
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@220 af15c1b1-3010-417e-b628-4374ebc0bcbd