[eigen] binder1st and binder2nd

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Dear all,

in its latest version, Eigen is still using std::binder1st and std::binder2nd.

As indicated in http://en.cppreference.com/w/cpp/utility/functional/binder12
those functions are deprecated since C++11 and will disappear in C++17.

Rationale for doing so is given in binders.h of gcc 5.1.0:
   *  These functions are deprecated in C++11 and can be replaced by
   *  @c std::bind (or @c std::tr1::bind) which is more powerful and flexible,
   *  supporting functions with any number of arguments.  Uses of @c bind1st
   *  can be replaced by @c std::bind(f, x, std::placeholders::_1) and
   *  @c bind2nd by @c std::bind(f, std::placeholders::_1, x).



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