KIM.cmake: add workaround for <cmake-3.12

set(KIM-API_MIN_VERSION 2.1.3)

find_package(CURL)

if(CURL_FOUND)

  if(CMAKE_VERSION VERSION_LESS 3.12)

    target_include_directories(lammps PRIVATE ${CURL_INCLUDE_DIRS})

    target_link_libraries(lammps PRIVATE ${CURL_LIBRARIES})

  else()

    target_link_libraries(lammps PRIVATE CURL::libcurl)

  endif()

  target_compile_definitions(lammps PRIVATE -DLMP_KIM_CURL)

  set(LMP_DEBUG_CURL OFF CACHE STRING "Set libcurl verbose mode on/off. If on, it displays a lot of verbose information about its operations.")

  mark_as_advanced(LMP_DEBUG_CURL)