patch 8.2.0312: Vim9: insufficient script tests

Problem:    Vim9: insufficient script tests.
Solution:   Add more tests.  Make "import * as Name" work.
diff --git a/src/proto/vim9script.pro b/src/proto/vim9script.pro
index 29fa269..18edb86 100644
--- a/src/proto/vim9script.pro
+++ b/src/proto/vim9script.pro
@@ -4,5 +4,6 @@
 void ex_export(exarg_T *eap);
 void free_imports(int sid);
 void ex_import(exarg_T *eap);
-char_u *handle_import(char_u *arg_start, garray_T *gap, int sid);
+int find_exported(int sid, char_u **argp, int *name_len, ufunc_T **ufunc, type_T **type);
+char_u *handle_import(char_u *arg_start, garray_T *gap, int import_sid);
 /* vim: set ft=c : */