patch 8.0.0834: can't build without the client-server feature

Problem:    Can't build without the client-server feature.
Solution:   Add #ifdef.
diff --git a/src/version.c b/src/version.c
index 4a77bdd..539fca2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    834,
+/**/
     833,
 /**/
     832,