Build cslib static or as shared

  option(MESSAGE_ZMQ "Use ZeroMQ in MESSAGE package" OFF)

  file(GLOB_RECURSE cslib_SOURCES ${LAMMPS_LIB_SOURCE_DIR}/message/cslib/*.F

      ${LAMMPS_LIB_SOURCE_DIR}/message/cslib/*.c ${LAMMPS_LIB_SOURCE_DIR}/message/cslib/*.cpp)

  if(BUILD_SHARED_LIBS)

      add_library(cslib SHARED ${cslib_SOURCES})

  else()

      add_library(cslib STATIC ${cslib_SOURCES})

  endif()

  if(BUILD_MPI)

    target_compile_definitions(cslib PRIVATE -DMPI_YES)