contrib: osmo-bts now depends on libosmo-netif

Since osmo-bts.git a2dc808acc5b99122e97c9013cb1ec2ae0c4a2a1, osmo-bts
depends on libosmo-netif. Let's add the dependency when building.

Change-Id: I8e40b2de19ecfca084780f69808c7030817e43d7
diff --git a/contrib/jenkins-build-osmo-bts.sh b/contrib/jenkins-build-osmo-bts.sh
index 182dbf7..27f82cc 100755
--- a/contrib/jenkins-build-osmo-bts.sh
+++ b/contrib/jenkins-build-osmo-bts.sh
@@ -8,6 +8,7 @@
 
 build_repo libosmocore ${SANITIZE_FLAGS} --disable-doxygen
 build_repo libosmo-abis ${SANITIZE_FLAGS} --disable-dahdi
+build_repo libosmo-netif ${SANITIZE_FLAGS} --disable-doxygen
 build_repo osmo-bts ${SANITIZE_FLAGS} --enable-trx --with-openbsc=$base/openbsc/openbsc/include --enable-octphy --with-octsdr-2g=$base/octphy-2g-headers
 
 create_bin_tgz "osmo-bts-trx osmo-bts-octphy osmo-bts-virtual"