patch 8.2.3411: Vim9: crash when using base name of import

Problem:    Vim9: crash when using base name of import. (Naohiro Ono)
Solution:   Check the import flags. (closes #8843)
diff --git a/src/evalvars.c b/src/evalvars.c
index 1af9ec5..5a26eff 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -3260,6 +3260,12 @@
 		semsg(_(e_redefining_imported_item_str), name);
 		goto failed;
 	    }
+	    if (import->imp_flags & IMP_FLAGS_STAR)
+	    {
+		semsg(_(e_cannot_use_str_itself_it_is_imported_with_star),
+									 name);
+		goto failed;
+	    }
 	    sv = ((svar_T *)si->sn_var_vals.ga_data) + import->imp_var_vals_idx;
 
 	    where.wt_variable = TRUE;