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: I4b87cb0d80bda7bbfda600310aee24a814f97f3f

.gitignore

@@ -83,3 +83,5 @@ doc/manuals/generated/
 doc/manuals/osmomsc-usermanual.xml
 doc/manuals/common
 doc/manuals/build
+
+contrib/osmo-bsc.spec

configure.ac

@@ -254,4 +254,5 @@ AC_OUTPUT(
     doc/manuals/Makefile
     contrib/Makefile
     contrib/systemd/Makefile
+    contrib/osmo-bsc.spec
     Makefile)

contrib/osmo-bsc.spec.in

@@ -12,26 +12,24 @@
 # 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:        @VERSION@
 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
 Group:          Hardware/Mobile
-URL:            https://osmocom.org/projects/openbsc/wiki/Osmo-bsc
+URL:            https://osmocom.org/projects/osmobsc
 Source:         %{name}-%{version}.tar.xz
 BuildRequires:  automake >= 1.9
 BuildRequires:  libtool >= 2
 BuildRequires:  pkgconfig >= 0.20
+%if 0%{?suse_version}
 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 +98,7 @@ make %{?_smp_mflags}
 %install
 %make_install
 
+%if 0%{?suse_version}
 %preun
 %service_del_preun %{name}.service
 
@@ -111,6 +110,7 @@ make %{?_smp_mflags}
 
 %post
 %service_add_post %{name}.service
+%endif
 
 %check
 make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)