[ada, build] Ignore cp -p failures during Ada make install

[Mike Stump]

On Apr 25, 2014, at 10:01 AM, Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> wrote:
> Agreed that this is ugly: ACL support in GNU coreutils has long been a
> total mess; no idea if it has improved very recently.

So, are there ACLs on these files?  If so, why?  If no ACLs, I fail to see how anything can error out no matter how poorly written it is.

What about cp a b && touch -r a b?  Seems safer, seem portable enough.