octave-struct and octave-optim: license change from GPLv2+ to GPLv3+

[Thomas Sailer]

I'd like to push octave-struct v1.0.10 and octave-optim v1.1.0 to 
rawhide; octave-struct and octave-optim change, like the rest of the 
octave forge repository, the license from GPLv2+ to GPLv3+.

The only package that depends on octave-struct in the repository
that I am aware of is octave-optim, and octave-optim is only required by 
octave-signal, which is already GPLv3+.

Are there any objections?

Thanks,
Tom