patch 8.2.0819: compiler warning for unused variable

Problem:    Compiler warning for unused variable.
Solution:   Remove the variable.
diff --git a/src/version.c b/src/version.c
index a5d2a8f..63bf51d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    819,
+/**/
     818,
 /**/
     817,