code: def load_libdmtx():
      
      global LIBDMTX
      global EXTERNAL_DEPENDENCIES
      if not LIBDMTX:
          LIBDMTX = dmtx_library.load()
          EXTERNAL_DEPENDENCIES = [LIBDMTX]
  
      return LIBDMTX
docs: Loads the libdmtx shared library.
  
      Populates the globals LIBDMTX and EXTERNAL_DEPENDENCIES.