Use glibc version information in zic and zdump

[Mike Frysinger]

On Sunday 11 November 2012 17:09:28 Joseph S. Myers wrote:
> On Sun, 11 Nov 2012, Mike Frysinger wrote:
> > > >  timezone/version.h    |   1 +
> > > 
> > > I mean, why would anyone do that *in the future, accidentally*?
> > 
> > because accidents happen.  a single line added to gitignore is a trivial
> > price to pay to help keep people from messing up in the future.
> 
> My point is that this is not any more likely than any number of other
> hypothetical accidents, and cluttering up .gitignore with random
> implausible hypothetical accidents is just noise.  You could equally do
> this for any other file that has been removed from the source tree, or
> proposed in a patch that was not committed, and it would be no more or
> less useful.

the difference is that this file is shipped in an external package that we pull 
into the tree in a semi-automated basis
-mike
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