`extra_defines=` are deprecated

[cooljeanius]

I get the following message in my console whenever loading the campaign menu:

20231224 00:18:39 error deprecation: campaign id='Defense_of_Elensefar' has extra_defines=ENABLE_ANCIENT_LICH has been deprecated and removed.; instead, use the macro with the same name in the [campaign] tag

Pretty self-explanatory; should be easy to fix.

[cooljeanius]

@stevecotton would you prefer for me to cover this in PR #3, or open a separate PR for it, or are you going to handle it yourself?

[stevecotton]

I think I need to explain what happened with DoE: because it was included in the Forgotten Conflicts add-on, I mostly forgot about it as a standalone add-on. I intended to replace the lighthouses' hacky vision tricks with 1.16's new vision support, and the fix for the extra_defines= would get tested along with that.

If you're getting the error, I guess you've manually installed it from Git or copied from 1.14. Sorry, I assumed that no-one else was being bothered by the error - if you're using a Git clone, the fix is already in the will_rebase/release_testing branch, but as that branch's name implies, there's a chance it will rebase.