Include icupkg executable on Windows to allow easy time zone data upgrade
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                 Key: CORE-6215
                 URL: http://tracker.firebirdsql.org/browse/CORE-6215
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine, Installation
    Affects Versions: 4.0 Beta 1
            Reporter: Mark Rotteveel


For users to upgrade the tzdata, there are two procedures[1]:

1. Use icupkg to integrate the new time zone data in the ICU data file
2. Put the newer files in a directory and point ICU_TIMEZONE_FILES_DIR to it

The first option is currently hard to do on Windows, because you need the 
icupkg executable, which doesn't seem to available unless you compile from 
source yourself. The second requires setting an environment variable which is 
for a service is rather awkward to do[2].

To ease use of option 1, I suggest that we include a compiled version of icupkg 
in the Windows build.


 [1]: 
http://userguide.icu-project.org/datetime/timezone#TOC-Updating-the-Time-Zone-Data
 [2]: 
https://stackoverflow.com/questions/305870/accessing-environment-variables-from-windows-services

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