`deprecated_apis` is now inside `ld`.
```
lightningd/notification.c: In function ‘connect_notification_serialize’:
lightningd/notification.c:60:13: error: ‘deprecated_apis’ undeclared (first use in this function)
60 | if (deprecated_apis)
| ^~~~~~~~~~~~~~~
lightningd/notification.c:60:13: note: each undeclared identifier is reported only once for each function it appears in
lightningd/notification.c: In function ‘disconnect_notification_serialize’:
lightningd/notification.c:97:13: error: ‘deprecated_apis’ undeclared (first use in this function)
97 | if (deprecated_apis)
| ^~~~~~~~~~~~~~~
lightningd/notification.c: In function ‘block_added_notification_serialize’:
lightningd/notification.c:612:13: error: ‘deprecated_apis’ undeclared (first use in this function)
612 | if (deprecated_apis) {
| ^~~~~~~~~~~~~~~
make: *** [Makefile:299: lightningd/notification.o] Error 1
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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