message: cmake: don't force -Werror=...
  improve compatibility with further compiler versions
  warnings are not errors by default
diff: @@ -119,12 +119,12 @@ if(CV_GCC OR CV_CLANG)
  # we want.
  add_extra_compiler_option(-Wall)
  endif()
  - add_extra_compiler_option(-Werror=return-type)
  - add_extra_compiler_option(-Werror=non-virtual-dtor)
  - add_extra_compiler_option(-Werror=address)
  - add_extra_compiler_option(-Werror=sequence-point)
  + add_extra_compiler_option(-Wreturn-type)
  + add_extra_compiler_option(-Wnon-virtual-dtor)
  + add_extra_compiler_option(-Waddress)
  + add_extra_compiler_option(-Wsequence-point)
  add_extra_compiler_option(-Wformat)
  - add_extra_compiler_option(-Werror=format-security -Wformat)
  + add_extra_compiler_option(-Wformat-security -Wformat)
  add_extra_compiler_option(-Wmissing-declarations)
  add_extra_compiler_option(-Wmissing-prototypes)
  add_extra_compiler_option(-Wstrict-prototypes)
  