patch 8.2.1728: compiler warning for using uninitialized variable

Problem:    Compiler warning for using uninitialized variable. (John Marriott)
Solution:   Initialize "neighbor".
diff --git a/src/version.c b/src/version.c
index cafc31d..a9852e9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1728,
+/**/
     1727,
 /**/
     1726,