Update ntp port to 4.0.91.

I decided, not to choose the newest developement snapshot,
because it's a rapidly moving target and as you can see,
they doesn't store older SNAP's on their master site.

This would break the port every now and then and I don't
want to update the port on a daily or weekly basis (at least
it's a resource problem of time and money, this thing is too
big and expensive for me here in Germany).

-rw-r--r--   1 59       59       4528325 Jan 10 15:33 ntp-4.0.91.tar.gz
                                             ^^
-rw-r--r--   1 59       59       4552788 Jan 26 22:22 ntp-4.0.91d.tar.gz
                                             ^^                 ^

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