message: cmake: fix compiler flags (CPU_BASELINE_REQUIRED=xxx + CPU_BASELINE=DETECT)
diff: # CPU_DISPATCH_FINAL=<list> - final list of dispatched optimizations
  #
  # CPU_DISPATCH_FLAGS_${opt} - flags for source files compiled separately (<name>.avx2.cpp)
  +#
  +# CPU_{opt}_ENABLED_DEFAULT=ON/OFF - has compiler support without additional flag (CPU_BASELINE_DETECT=ON only)
  set(CPU_ALL_OPTIMIZATIONS "SSE;SSE2;SSE3;SSSE3;SSE4_1;SSE4_2;POPCNT;AVX;FP16;AVX2;FMA3;AVX_512F;AVX512_SKX")
  list(APPEND CPU_ALL_OPTIMIZATIONS NEON VFPV3 FP16)
  @@ -345,6 +347,7 @@ macro(ocv_check_compiler_optimization OPT)
  ocv_check_compiler_flag(CXX "${CPU_BASELINE_FLAGS}" "${_varname}" "${CPU_${OPT}_TEST_FILE}")
  if(${_varname})
  list(APPEND CPU_BASELINE_FINAL ${OPT})
  + set(CPU_${OPT}_ENABLED_DEFAULT ON)
  set(__available 1)
  endif()
  endif()
  @@ -462,7 +465,7 @@ foreach(OPT ${CPU_KNOWN_OPTIMIZATIONS})
  if(NOT ";${CPU_BASELINE_FINAL};" MATCHES ";${OPT};")
  list(APPEND CPU_BASELINE_FINAL ${OPT})
  endif()
  - if(NOT CPU_BASELINE_DETECT) # Don't change compiler flags in 'detection' mode
  + if(NOT CPU_${OPT}_ENABLED_DEFAULT) # Don't change compiler flags in 'detection' mode
  ocv_append_optimization_flag(CPU_BASELINE_FLAGS ${OPT})
  endif()
  endif()
  