[Freeciv-Dev] Worklist fix

[Thue <thue@xxxxxxx>]

To reproduce bug:
Take a city A building a wonder. Finish the wonder in another city, now A 
builds a wonder finished elsewhere, which is allowed as in civ 2. Now open 
A's worklist and insert something after the current build. click ok.

The worklist purge algoritm will see that you cannot build the top item and 
purge it. But it should leave it be.

Patch attached.
I don't know why, but the amiga version of the relevant code is different 
from the xaw and gtk code. I am leaving it up to the amiga people to 
implement, test and commit their solution.

-Thue

wonder_worklist_fix.diff
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