reject merges on gdb release branches?

[Tom Tromey]

Joel> At AdaCore, we use a comma-separated list of regular expressions
Joel> to match the branches for which a features should not be applied.
Joel> Perhaps we could do the same? I don't have much time right now
Joel> either, so status quo ante it is.

The syntax is just determined by the update hook script.
So I think we'd need a different script.
We have modest needs so it maybe isn't too hard to find an appropriate one.
I can't do it now.

Tom