contrib: integrate RPM spec

Remove OpenSUSE bug report link, set version to @VERSION@, make it build
with CentOS 8 etc.

Related: OS#4550
Change-Id: I38f80d0f867a2bbaa09b5a42cad5028f23a8effa
diff --git a/configure.ac b/configure.ac
index 0e03ff0..4ed6978 100644
--- a/configure.ac
+++ b/configure.ac
@@ -200,6 +200,7 @@
 	contrib/Makefile
 	contrib/systemd/Makefile
 	contrib/dgsm/Makefile
+	contrib/osmo-hlr.spec
 	tests/Makefile
 	tests/auc/Makefile
 	tests/auc/gen_ts_55_205_test_sets/Makefile