The SPEC file already included a build dependency to libsmpp34, but
then the compilation of osmo-msc didn't actually pass --enable-smpp
along, resulting in binaries without SMPP support - unlike the Debian
binaries, which do contain that part.
Change-Id: I223be7a735e97b32f7c0ff246cf826f109b0f686
Remove OpenSUSE bug report link, set version to @VERSION@, make it build
with CentOS 8 etc.
Related: OS#4550
Change-Id: If5499e11d872e629a018fc77d5adf5d0cb863d48