tests: switch away from HAVE_SOCKETPAIR

Since the removal of gnulib, HAVE_SOCKETPAIR is no more defined, making
these two tests effectively skipped.

Use the same strategy used in other generic library bits, i.e. exclude
the socketpair usage on Windows.

Semi-related change in virnetdaemontest.c to make it build: since
virutil.h does not include unistd.h anymore, we need to include it.
Signed-off-by: NPino Toscano <ptoscano@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

tests/virnetdaemontest.c

@@ -18,13 +18,15 @@
 
 #include <config.h>
 
+#include <unistd.h>
+
 #include "testutils.h"
 #include "virerror.h"
 #include "rpc/virnetdaemon.h"
 
 #define VIR_FROM_THIS VIR_FROM_RPC
 
-#if defined(HAVE_SOCKETPAIR) && defined(WITH_YAJL)
+#if !defined(WIN32) && defined(WITH_YAJL)
 struct testClientPriv {
     int magic;
 };

tests/virnetserverclienttest.c

@@ -24,7 +24,7 @@
 
 #define VIR_FROM_THIS VIR_FROM_RPC
 
-#ifdef HAVE_SOCKETPAIR
+#ifndef WIN32
 
 static void *
 testClientNew(virNetServerClientPtr client G_GNUC_UNUSED,