Bug#864831: NTL update to 10.3.0

[Tobias Hansen]

Hi,

thanks for uploading sage 8.0 and sorry that I was not there to help.

Now is a good time for the NTL transition. Julien, could you update the
package to 10.3.0? Then we can test-build the reverse dependencies and
ask for a transition.

Best,

Tobias