fix api changes in xen restore

in recently xen commit: 7051d5c8, there is a api changes in
libxl_domain_create_restore.
Author: Andrew Cooper <andrew.cooper3@citrix.com>
Date:   Thu Oct 10 12:23:10 2013 +0100

    tools/migrate: Fix regression when migrating from older version of Xen

use the macro LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS in libxl.h
in order to make libvirt could compile with old and new xen.

the params checkpointed_stream is useful if libvirt libxl driver
support migration. for new, set it as zero.
Signed-off-by: NBamvor Jian Zhang <bjzhang@suse.com>

src/libxl/libxl_driver.c

@@ -555,6 +555,9 @@ libxlVmStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
     int managed_save_fd = -1;
     libxlDomainObjPrivatePtr priv = vm->privateData;
     libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
+#ifdef LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS
+    libxl_domain_restore_params params;
+#endif
 
     if (libxlDomainObjPrivateInitCtx(vm) < 0)
         goto error;
@@ -619,8 +622,14 @@ libxlVmStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
         ret = libxl_domain_create_new(priv->ctx, &d_config,
                                       &domid, NULL, NULL);
     else
+#ifdef LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS
+        params.checkpointed_stream = 0;
+        ret = libxl_domain_create_restore(priv->ctx, &d_config, &domid,
+                                          restore_fd, &params, NULL, NULL);
+#else
         ret = libxl_domain_create_restore(priv->ctx, &d_config, &domid,
                                           restore_fd, NULL, NULL);
+#endif
 
     if (ret) {
         if (restore_fd < 0)