[tz] Beginner's help request

[Paul Eggert]

Tom Lane wrote:
> would it be reasonable
> to request that that file contain some version-identifying info?

Although we've avoided putting a version number into the existing binary format 
due to compatibility concerns, adding a comment to tzdata.zi shouldn't be so 
constrained. How about the attached patch? It prepends the following comment 
line to tzdata.zi in the current development version:

# version 2017c-18-ga5a40b4

Here, "2017c-18-ga5a40b4" has the same meaning as in the file 'version': release 
2017c plus 18 updates, with a Git checksum of a5a40b4. If the working files have 
uncommitted changes, the version string has "-dirty" appended.
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