Avoid Compilation 'note' on GCC 6 ARM

[jean-michel-gonet]

Why?

• Because we shouldn't have warnings at compilation
• This particular warning is described here: Compilation "note" on GCC 6 ARM nlohmann/json#658
• And here: https://stackoverflow.com/questions/48149323/strange-gcc-warning-when-compiling-qt-project
• It looks like:

note: parameter passing for argument of type ‘__gnu_cxx::__normal_iterator<double*, std::vector<double, std::allocator<double> > >’ will change in GCC 7.1

Condition of satisfaction

• As long as all your C++ code is built with GCC 7.1 or later, you can safely ignore this warning. To disable it, pass -Wno-psabi to the compiler.