debian/rules: Make sure we always require libusrp

Change-Id: Id9c9188a24617f83efa0e1fcf54f9e0dd223e365
diff --git a/debian/rules b/debian/rules
index e6e8c75..c700bce 100755
--- a/debian/rules
+++ b/debian/rules
@@ -8,5 +8,8 @@
 override_dh_shlibdeps:
 	dh_shlibdeps --dpkg-shlibdeps-params=--ignore-missing-info
 
+override_dh_auto_configure:
+	dh_auto_configure -- --with-usrp1
+
 override_dh_strip:
 	dh_strip --dbg-package=osmo-trx-dbg