patch 8.2.3339: Vim9: cannot lock a member in a local dict

Problem:    Vim9: cannot lock a member in a local dict.
Solution:   Get the local dict from the stack and pass it to get_lval().
diff --git a/src/globals.h b/src/globals.h
index ebf236b..f09ad48 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1835,6 +1835,8 @@
 #endif
 #ifdef FEAT_EVAL
 EXTERN int  input_busy INIT(= 0);   // when inside get_user_input() then > 0
+
+EXTERN typval_T	*lval_root INIT(= NULL);
 #endif
 
 #ifdef FEAT_BEVAL_TERM