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/.gitignore b/.gitignore
index 0965935..3d9c81b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -67,3 +67,5 @@
 doc/manuals/osmomsc-usermanual.xml
 doc/manuals/common
 doc/manuals/build
+
+contrib/osmo-hlr.spec