patch 8.2.3395: Vim9: expression breakpoint not checked in :def function

Problem:    Vim9: expression breakpoint not checked in :def function.
Solution:   Always compile a function for debugging if there is an expression
            breakpoint. (closes #8803)
diff --git a/src/proto/debugger.pro b/src/proto/debugger.pro
index e018622..d80ecf5 100644
--- a/src/proto/debugger.pro
+++ b/src/proto/debugger.pro
@@ -6,6 +6,7 @@
 int dbg_check_skipped(exarg_T *eap);
 void ex_breakadd(exarg_T *eap);
 void ex_debuggreedy(exarg_T *eap);
+int debug_has_expr_breakpoint(void);
 void ex_breakdel(exarg_T *eap);
 void ex_breaklist(exarg_T *eap);
 linenr_T dbg_find_breakpoint(int file, char_u *fname, linenr_T after);