try using faster alternatives to GNU ld when building (many) test executables

  set(MEMORYCHECK_COMMAND "${VALGRIND_BINARY}" CACHE FILEPATH "Memory Check Command")

  set(MEMORYCHECK_COMMAND "${VALGRIND_BINARY}" CACHE FILEPATH "Memory Check Command")

  set(MEMORYCHECK_COMMAND_OPTIONS "${VALGRIND_DEFAULT_OPTIONS}" CACHE STRING "Memory Check Command Options")

  set(MEMORYCHECK_COMMAND_OPTIONS "${VALGRIND_DEFAULT_OPTIONS}" CACHE STRING "Memory Check Command Options")

  # check if a faster linker is available

  include(CheckCXXCompilerFlag)

  check_cxx_compiler_flag(-fuse-ld=lld HAVE_LLD_LINKER)

  check_cxx_compiler_flag(-fuse-ld=gold HAVE_GOLD_LINKER)

  if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)

    if(HAVE_LLD_LINKER)

      target_link_options(lammps PUBLIC -fuse-ld=lld)

    elseif(HAVE_OLD_LINKER)

      target_link_options(lammps PUBLIC -fuse-ld=gold)

    endif()

  endif()

  include(CTest)

  include(CTest)

  enable_testing()

  enable_testing()