contrib: integrate RPM spec

Remove OpenSUSE bug report link, set version to 0.0.0, make it build with CentOS 8 etc.

Related: OS#4550
Change-Id: I4b87cb0d80bda7bbfda600310aee24a814f97f3f

contrib/osmo-bsc.spec

@@ -12,16 +12,12 @@
 # license that conforms to the Open Source Definition (Version 1.9)
 # published by the Open Source Initiative.
 
-# Please submit bugfixes or comments via http://bugs.opensuse.org/
-#
-
 ## Disable LTO for now since it breaks compilation of the tests
 ## https://osmocom.org/issues/4113
 %define _lto_cflags %{nil}
 
-
 Name:           osmo-bsc
-Version:        1.6.0.78
+Version:        0.0.0
 Release:        0
 Summary:        OsmoBSC: Osmocom's Base Station Controller for 2G CS mobile networks
 License:        AGPL-3.0-or-later AND GPL-2.0-or-later
@@ -31,7 +27,11 @@ Source:         %{name}-%{version}.tar.xz
 BuildRequires:  automake >= 1.9
 BuildRequires:  libtool >= 2
 BuildRequires:  pkgconfig >= 0.20
+%if 0%{?centos_ver}
+BuildRequires:  systemd
+%else
 BuildRequires:  systemd-rpm-macros
+%endif
 BuildRequires:  pkgconfig(libcrypto) >= 0.9.5
 BuildRequires:  pkgconfig(libosmo-mgcp-client) >= 1.5.0
 BuildRequires:  pkgconfig(libosmo-netif) >= 0.6.0
@@ -100,6 +100,7 @@ make %{?_smp_mflags}
 %install
 %make_install
 
+%if 0%{?suse_version}
 %preun
 %service_del_preun %{name}.service
 
@@ -111,6 +112,7 @@ make %{?_smp_mflags}
 
 %post
 %service_add_post %{name}.service
+%endif
 
 %check
 make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)