* configure.in: xdr functions may require -lxdr.
	* configure.in, src/Makefile.am: Extra linking flags for
	  building libvirt DLL.
	* src/socketcompat.h: Hide Windows Winsock incompatibilities
	  in a separate header file.
	* src/remote_internal.c: Switch to using socketcompat.h /
	  socket_errno().
	* src/test.c: Switch to using socketcompat.h.
	* gnulib/lib/arpa/.cvsignore: Ignore another generated file.
	* src/qparams.c: Include <config.h>.