Bug#1014149: src:libksba: avoid -unknown suffix in version string

[Daniel Kahn Gillmor]

Package: src:libksba
Version: 1.6.0-2
Severity: minor

"gpgsm --version" reports:

libksba 1.6.0-unknown

This is because the build is a bit confused about what to put in that
part of the version string, because upstream's autogen.sh wants to
inspect the local git configuration to put information in the version
string.

It'd be better to drop the uninformative suffix and just identify the
version as 1.6.0.

(see also #1004742 in gpgme, gpgme's
debian/patches/0001-Remove-upstream-git-fanciness.patch and
libgpg-error's debian/patches/0001-Remove-upstream-git-fanciness.patch
as well for examples of other comparable cleanup for libraries from the
same upstream project with similar autogen.sh files)

   --dkg
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