Bug#992017: Alpha 25 packaging

[Fabio Pedretti]

Hi and thank you for working on this!
Before pushing the new release please consider the following:
1) 0ad 0.0.25b (aka Re-release of 0 A.D. Alpha 25) was just released
with some urgent fixes:
https://play0ad.com/re-release-of-0-a-d-alpha-25-yauna/ , please use
this rather than plani 0.0.25
2) lower icu dependency to at least 66.1-2~ : I built it this way and
it works flawlessly (I have a PPA here:
https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers/+packages).
This would make backporting to Ubuntu 20.04 easier
Thanks!