tests/migration-tests: Drop most WIN32 ifdefs for postcopy failure tests

Most of them are not needed, we can stick with one ifdef inside
postcopy_recover_fail() so as to cover the scm right tricks only.
The tests won't run on windows anyway due to has_uffd always false.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index 6207305..b7dea1a 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -1364,9 +1364,9 @@
                                                   "completed", NULL });
 }
 
-#ifndef _WIN32
 static void postcopy_recover_fail(QTestState *from, QTestState *to)
 {
+#ifndef _WIN32
     int ret, pair1[2], pair2[2];
     char c;
 
@@ -1428,8 +1428,8 @@
     close(pair1[1]);
     close(pair2[0]);
     close(pair2[1]);
+#endif
 }
-#endif /* _WIN32 */
 
 static void test_postcopy_recovery_common(MigrateCommon *args)
 {
@@ -1469,7 +1469,6 @@
     wait_for_postcopy_status(to, "postcopy-paused");
     wait_for_postcopy_status(from, "postcopy-paused");
 
-#ifndef _WIN32
     if (args->postcopy_recovery_test_fail) {
         /*
          * Test when a wrong socket specified for recover, and then the
@@ -1478,7 +1477,6 @@
         postcopy_recover_fail(from, to);
         /* continue with a good recovery */
     }
-#endif /* _WIN32 */
 
     /*
      * Create a new socket to emulate a new channel that is different
@@ -1507,7 +1505,6 @@
     test_postcopy_recovery_common(&args);
 }
 
-#ifndef _WIN32
 static void test_postcopy_recovery_double_fail(void)
 {
     MigrateCommon args = {
@@ -1516,7 +1513,6 @@
 
     test_postcopy_recovery_common(&args);
 }
-#endif /* _WIN32 */
 
 #ifdef CONFIG_GNUTLS
 static void test_postcopy_recovery_tls_psk(void)
@@ -3782,10 +3778,8 @@
                            test_postcopy_preempt);
         migration_test_add("/migration/postcopy/preempt/recovery/plain",
                            test_postcopy_preempt_recovery);
-#ifndef _WIN32
         migration_test_add("/migration/postcopy/recovery/double-failures",
                            test_postcopy_recovery_double_fail);
-#endif /* _WIN32 */
         if (is_x86) {
             migration_test_add("/migration/postcopy/suspend",
                                test_postcopy_suspend);