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Generalize unit type build requirements
See Gna patch #1339 ( https://web.archive.org/web/20170307033654/http://gna.org/patch/?1339 )
I don't think a normal requirement vector would work. The tech requirements applies to regular players but barbarians may build a L_BARBARIAN_BUILD_TECH unit when any player has discovered the tech. An action enabler with a city actor could represent this.
Note that a unit type's build requirements is used for more than deciding if a city should be allowed to build it. See the "Upgrade Unit" action enabler and the "Upgrade_Unit" effect.