patch 8.2.4375: ctx_imports is not used

Problem:    ctx_imports is not used.
Solution:   Delete ctx_imports.  Add missing dependency.
diff --git a/src/vim9.h b/src/vim9.h
index 45e97a2..87ee6b1 100644
--- a/src/vim9.h
+++ b/src/vim9.h
@@ -691,7 +691,7 @@
 } lhs_T;
 
 /*
- * Context for compiling lines of Vim script.
+ * Context for compiling lines of a :def function.
  * Stores info about the local variables and condition stack.
  */
 struct cctx_S {
@@ -710,8 +710,6 @@
     int		ctx_has_closure;    // set to one if a closure was created in
 				    // the function
 
-    garray_T	ctx_imports;	    // imported items
-
     skip_T	ctx_skip;
     scope_T	*ctx_scope;	    // current scope, NULL at toplevel
     int		ctx_had_return;	    // last seen statement was "return"