patch 8.2.1464: Vim9: build warning for unused variable

Problem:    Vim9: build warning for unused variable.
Solution:   Delete the variable declaration.
diff --git a/src/version.c b/src/version.c
index 864c14b..4554fc4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1464,
+/**/
     1463,
 /**/
     1462,
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 7cf2d0c..5670a7c 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -2291,7 +2291,6 @@
 		    int		is_slice = iptr->isn_type == ISN_LISTSLICE;
 		    list_T	*list;
 		    varnumber_T	n1, n2;
-		    listitem_T	*li;
 
 		    // list index: list is at stack-2, index at stack-1
 		    // list slice: list is at stack-3, indexes at stack-2 and