[Freeciv-Dev] Stop AI from trying to make illegal cities

[Thue Janus Kristensen <thue.kristensen@xxxxxxxxxx>]

When it was made illegal to make cities adjacent to one another you forgot to
tell the ai autosettlers. As a result, at some point most AI autosettlers will
just stand and try to make a city turn after turn. This patch fixes that.
That the AI shouldn't be trying in the first place, and that it still builds
cities on developed islands late in the game when it takes squares from allready
existent big cities is another thing.

-Thue

slightly_less_idiotic_ai_settlers.diff
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