Use osmo_fd_*_{disable,enable}

Change-Id: I16563a1033ad12a32104bfee974045ac4302bc74
Depends: libosmocore.git Idb89ba7bc7c129a6304a76900d17f47daf54d17d
diff --git a/TODO-RELEASE b/TODO-RELEASE
index 17c6a34..40932ee 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -8,3 +8,4 @@
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library        what            description / commit summary line
 osmo-pcu        update osmo-gsm-manuals dependency to > 0.3.0 for vty_cpu_sched.adoc include
+osmo-pcu	update libosmocore dependency > 1.4.x for osmo_fd_{read,write}_{enable,disable}