small configure fix

[Rok Mandeljc]

I've been checking configure script today because it wouldn't find ipx
support even if i had it. When detecting ipx support it checks if there is
sys/socket.h available (using #ifdef HAVE_SYS_SOCKET or something like that)
and if it is, it use it... but the problem is that we check for sys/socket.h
and include it later so it looks like there's no sys/socket.h available.
I've disabled #ifdef clauses since in my opinion they're unnecessary; if
there's no sys/socket.h, theres no ipx support (like it was until now =) ).

ChangeLog:
 - fixed ipx support detection in configure script
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