Cannot update firebird25 after recent icu update

[Walter Schwarzenfeld]

Stop update icu!!
There are some problems.

I had to deinstall firebird25-client and three other packages and 
reinstall it, to bring compile to work.
Icu     update does not work on 93-i386.
After update of icu I had    no text in thudnerbird. Neither in menues 
nor in accounts etc.

For the last two issue I filed a PR on bugzllla.