debugger_dap: Emit Output event on sys_message

src/debugger.c

@@ -325,3 +325,12 @@ void dbg_onsleep(void) {
 	if (dbg_impl)
 		dbg_impl->onsleep();
 }
+
+boolean dbg_console_vprintf(const char *format, va_list ap) {
+	if (!dbg_impl || !dbg_impl->console_output)
+		return false;
+	char buf[1024];
+	vsnprintf(buf, sizeof(buf), format, ap);
+	dbg_impl->console_output(buf);
+	return true;
+}