contrib/osmo-pcu.spec.in: add missing libosmoctrl dependency

Change-Id: I37c478f3f430f72620af17f1c3329f6ee8515402
Fixes: Id35f40d05f3e081f32fddbf1fa34cb338db452ca
diff --git a/contrib/osmo-pcu.spec.in b/contrib/osmo-pcu.spec.in
index c3be88c..a48a4ed 100644
--- a/contrib/osmo-pcu.spec.in
+++ b/contrib/osmo-pcu.spec.in
@@ -32,6 +32,7 @@
 BuildRequires:  pkgconfig(libosmogb) >= 1.4.0
 BuildRequires:  pkgconfig(libosmogsm) >= 1.4.0
 BuildRequires:  pkgconfig(libosmovty) >= 1.4.0
+BuildRequires:  pkgconfig(libosmoctrl) >= 1.4.0
 %{?systemd_requires}
 
 %description