Update libport: Be kind with the user: try to define _USE_MATH_DEFINES for him.
Update libport: Be kind with the user: try to define _USE_MATH_DEFINES for him.

    * libport: Here.

aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi