[eigen] Eigen warning.

[Billy Araujo <billyaraujo@xxxxxxxxx>]

Hi,

Just a warning when compiling Eigen3.3 in VS2013 64bit:

public:

  static From ms_from;

  enum { value = sizeof(test(ms_from, 0))==sizeof(yes) };

};

e:\libraries\eigen\eigen-3.3-beta1\eigen\src/Core/util/Meta.h(118): warning C4800: '__int64' : forcing value to bool 'true' or 'false' (performance warning)