remove fluff about adios in CMakeLists.txt.

# CMake build system

# This file is part of LAMMPS

# Created by Christoph Junghans and Richard Berger

if(PKG_USER-ADIOS)

  message(STATUS "Force newer standards because of using ADIOS")

  cmake_minimum_required(VERSION 3.6)

  # Force C++11 and C99

  set(CMAKE_CXX_STANDARD 11)

  set(CMAKE_CXX_STANDARD_REQUIRED True)

else()

cmake_minimum_required(VERSION 2.8.12)

endif()

project(lammps CXX)

set(SOVERSION 0)