configure ipx fix

[Roderick Colenbrander]

The way the configure script detects ipx support is a bit broken. As a part of 
the ipx detection the configure script compiles a small test app to see if 
ipx is supported. The test app allways seems to fail because it can't include 
sys/socket.h since HAVE_SYS_SOCKET_H is never defined.
The reason for this is that a check for sys/socket.h is missing.
This patch adds a check for sys/socket.h and fixes the ipx detection.

While typing this mail I found out that Rok Mandeljc submitted a similar 
patch. Use mine instead since his patch doesn't provide a real fix. It just 
removes the "#ifdef HAVE_SYS_SOCKET_H" from the test apps.

ChangeLog:
 o fixed ipx detection in the configure script
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