Update cmake build to work with cmake-based KIM

  if(DOWNLOAD_KIM)

    include(ExternalProject)

    ExternalProject_Add(kim_build

      URL https://github.com/openkim/kim-api/archive/v1.9.5.tar.gz

      URL_MD5 9f66efc128da33039e30659f36fc6d00

      BUILD_IN_SOURCE 1

      CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=<INSTALL_DIR>

      URL https://s3.openkim.org/kim-api/kim-api-v2.0.0-beta.2.txz

      URL_MD5 1fbdbb734059cf0dc9d807e6dd6cc8ea

      BINARY_DIR build

      CMAKE_ARGS -DCMAKE_CXX_COMPILER=g++-8 -DCMAKE_C_COMPILER=gcc-8 -DCMAKE_Fortran_COMPILER=gfortran-8 -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR> -DCMAKE_BUILD_TYPE=Release

      )

    ExternalProject_get_property(kim_build INSTALL_DIR)

    set(KIM_INCLUDE_DIRS ${INSTALL_DIR}/include/kim-api-v1)

    set(KIM_LIBRARIES ${INSTALL_DIR}/lib/libkim-api-v1.so)

    set(KIM-API-V2_INCLUDE_DIRS ${INSTALL_DIR}/include/kim-api-v2)

    set(KIM-API-V2_LIBRARIES ${INSTALL_DIR}/lib/libkim-api-v2.2${CMAKE_SHARED_LIBRARY_SUFFIX})

    list(APPEND LAMMPS_DEPS kim_build)

  else()

    find_package(KIM)

    if(NOT KIM_FOUND)

      message(FATAL_ERROR "KIM not found, help CMake to find it by setting KIM_LIBRARY and KIM_INCLUDE_DIR, or set DOWNLOAD_KIM=ON to download it")

    find_package(KIM-API-V2)

    if(NOT KIM-API-V2_FOUND)

      message(FATAL_ERROR "KIM not found, help CMake to find it by setting PKG_CONFIG_PATH, or set DOWNLOAD_KIM=ON to download it")

    endif()

  endif()

  list(APPEND LAMMPS_LINK_LIBS ${KIM_LIBRARIES})

  include_directories(${KIM_INCLUDE_DIRS})

  list(APPEND LAMMPS_LINK_LIBS ${KIM-API-V3_LIBRARIES})

  include_directories(${KIM-API-V2_INCLUDE_DIRS})

endif()

if(PKG_MESSAGE)

#

# CDDL HEADER START

#

# The contents of this file are subject to the terms of the Common Development

# and Distribution License Version 1.0 (the "License").

#

# You can obtain a copy of the license at

# http://www.opensource.org/licenses/CDDL-1.0.  See the License for the

# specific language governing permissions and limitations under the License.

#

# When distributing Covered Code, include this CDDL HEADER in each file and

# include the License file in a prominent location with the name LICENSE.CDDL.

# If applicable, add the following below this CDDL HEADER, with the fields

# enclosed by brackets "[]" replaced with your own identifying information:

#

# Portions Copyright (c) [yyyy] [name of copyright owner]. All rights reserved.

#

# CDDL HEADER END

#

#

# Copyright (c) 2013--2018, Regents of the University of Minnesota.

# All rights reserved.

#

# Contributors:

#    Richard Berger

#    Christoph Junghans

#    Ryan S. Elliott

#

#

# Release: This file is part of the kim-api.git repository.

#

# - Find KIM-API-V2

#

# sets standard pkg_check_modules variables plus:

#

# KIM-API-V2-CMAKE_C_COMPILER

# KIM-API-V2-CMAKE_CXX_COMPILER

# KIM-API-V2-CMAKE_Fortran_COMPILER

#

find_package(PkgConfig REQUIRED)

include(FindPackageHandleStandardArgs)

pkg_check_modules(KIM-API-V2 REQUIRED libkim-api-v2>=2.0)

pkg_get_variable(KIM-API-V2-CMAKE_C_COMPILER libkim-api-v2 CMAKE_C_COMPILER)

pkg_get_variable(KIM-API-V2-CMAKE_CXX_COMPILER libkim-api-v2 CMAKE_CXX_COMPILER)

pkg_get_variable(KIM-API-V2_CMAKE_Fortran_COMPILER libkim-api-v2 CMAKE_Fortran_COMPILER)

# handle the QUIETLY and REQUIRED arguments and set KIM-API-V2_FOUND to TRUE

# if all listed variables are TRUE

find_package_handle_standard_args(KIM-API-V2 REQUIRED_VARS KIM-API-V2_LIBRARIES)

# - Find kim

# Find the native KIM headers and libraries.

#

#  KIM_INCLUDE_DIRS - where to find kim.h, etc.

#  KIM_LIBRARIES    - List of libraries when using kim.

#  KIM_FOUND        - True if kim found.

#

find_path(KIM_INCLUDE_DIR KIM_SimulatorHeaders.hpp PATH_SUFFIXES kim-api-v2)

find_library(KIM_LIBRARY NAMES kim-api-v2)

set(KIM_LIBRARIES ${KIM_LIBRARY})

set(KIM_INCLUDE_DIRS ${KIM_INCLUDE_DIR})

include(FindPackageHandleStandardArgs)

# handle the QUIETLY and REQUIRED arguments and set KIM_FOUND to TRUE

# if all listed variables are TRUE

find_package_handle_standard_args(KIM DEFAULT_MSG KIM_LIBRARY KIM_INCLUDE_DIR)

mark_as_advanced(KIM_INCLUDE_DIR KIM_LIBRARY )