Use glibc version information in zic and zdump

[Mike Frysinger]

On Sunday 11 November 2012 13:53:44 Joseph S. Myers wrote:
> On Sat, 10 Nov 2012, Mike Frysinger wrote:
> > On Saturday 10 November 2012 11:57:13 Joseph S. Myers wrote:
> > > On Sat, 10 Nov 2012, Mike Frysinger wrote:
> > > > On Friday 09 November 2012 19:24:32 Joseph S. Myers wrote:
> > > > > --- a/timezone/version.h
> > > > > +++ /dev/null
> > > > 
> > > > add this file to .gitignore so that if someone tries to `git add` it,
> > > > they'll get an error ?  or do we not expect to do syncs with tzcode
> > > > in the future ?
> > > 
> > > Why would anyone try "git add" on this particular file name?
> > 
> > commit 92e4b6a92716f8b2457376291171a6330d072b0d
> > Author: Joseph Myers <joseph@codesourcery.com>
> > Date:   Fri Nov 9 21:20:57 2012 +0000
> > 
> >     Update tzcode to 2012i.
> >  
> >  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.

> unless upstream tzcode changes its versioning system again so that a
> source-code version.h becomes appropriate, in which case a .gitignore
> entry for version.h would just mean a make-work extra step in the update
> of editing .gitignore.

this is hardly significant maintenance overhead for a hypothetical situation 
that cannot be predicted.
-mike
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