message: cmake: fix supporting of legacy flags
diff: @@ -56,7 +56,7 @@ macro(ocv_optimization_process_obsolete_option legacy_flag OPT legacy_warn)
  message(STATUS " Behaviour of this option is not backward compatible")
  message(STATUS " Refer to 'CPU_BASELINE'/'CPU_DISPATCH' CMake options documentation")
  endif()
  - if("${legacy_flag}")
  + if("${${legacy_flag}}")
  if(NOT ";${CPU_BASELINE_REQUIRE};" MATCHES ";${OPT};")
  set(CPU_BASELINE_REQUIRE "${CPU_BASELINE_REQUIRE};${OPT}" CACHE STRING "${HELP_CPU_BASELINE_REQUIRE}" FORCE)
  endif()
  