[freeciv-ai] fstk fix for subs

["Per I. Mathisen" <per@xxxxxxxxxxx>]

This patch makes fstk work with subs. Previously fstk would try to make
subs attack cities, would just looked silly.

Will commit soon.

  - Per

"This is the future for the world we're in at the moment,"
promised Lawrence Di Rita, special assistant to Rumsfeld.
"We'll get better as we do it more often."

fstk1.diff
Description: Text document