armadillo changed the license to mpl2

[José Matos]

Latest version of armadillo 3.800 has changed the license from LGPLv2.1
to MPLv2.

The only user of armadillo in Fedora (for now) is mlpack licensed as
LGPLv3 so the change will have no impact in other packages.

I will update to the latest version initially in rawhide and then on F17
and F18 since 3.6 is no longer maintained and 3.800 is API backwards
compatible with previous 3.x versions.

Regards,

-- 
José Matos