Makefile.am: EXTRA_DIST: debian, contrib/*.spec.in

Change-Id: If17e82c5fe1fc49877a5a3d9ba250e86091e253c
diff --git a/Makefile.am b/Makefile.am
index 48051f2..85e3c65 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,7 +1,12 @@
 AUTOMAKE_OPTIONS = foreign dist-bzip2 1.6
 
 SUBDIRS = include src doc tests contrib
-EXTRA_DIST = osmoappdesc.py README.md
+EXTRA_DIST = \
+	     README.md \
+	     contrib/osmo-pcu.spec.in \
+	     debian \
+	     osmoappdesc.py \
+	     $(NULL)
 
 AM_DISTCHECK_CONFIGURE_FLAGS = \
 	--with-systemdsystemunitdir=$$dc_install_base/$(systemdsystemunitdir)