Simplify usage of the old segment decoding libraries with the slot coding interface

This MR transforms the segment coding libraries into slot coding libraries by statically linking the adaptation layer and the segment coding libraries.
Therefore they can be used directly in ldpctest which uses the segment coding interface as well as in all the other PHY simulators and the NR softmodem which use the slot coding interface.
It is not anymore needed to use the --nrLDPC_coding_segment.segment_shlibversion flag.
Instead a segment coding library can be directly chosen with --loader.ldpc.shlibversion since it implements the slot coding interface.