patch 8.0.1172: when E734 is given option is still set

Problem:    When E734 is given option is still set.
Solution:   Assign NULL to "s". (Christian Brabandt)
diff --git a/src/version.c b/src/version.c
index 925a6cd..6e3f90a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1172,
+/**/
     1171,
 /**/
     1170,