fix warning ld boost prog options

[kerautret]

PR Description

small PR related to the ld boost prog options warnings like:

ld: warning: direct access in function 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injectorboost::program_options::validation_error >::rethrow() const' from file '/usr/local/lib/libboost_program_options.a(value_semantic.o)' to global weak symbol 'typeinfo for boost::exception_detail::clone_impl<boost::exception_detail::error_info_injectorboost::program_options::validation_error >' from file 'CMakeFiles/shapeGenerator.dir/shapeGenerator.cpp.o' means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.

Checklist

• Doxygen documentation of the code completed (classes, methods, types, members...).
• Main tool doxygen documentation (following existing documentation of DGtalTools documentation.
• Check if it follows the tools structure described in CONTRIBUTING.md
• New entry in the ChangeLog.md added.
• Update the readme with potentially a screenshot of the tools if it applies.
• No warning raised in Debug cmake mode (otherwise, Travis C.I. will fail).