Extract libnitrokey version from crate version

This patch uses the nitrokey-sys-rs crate version to extract the version
of the contained libnitrokey and to deduce the name of the libnitrokey
directory.

The implementation uses these assumptions:
1. The crate major and minor version match the libnitrokey major and
   minor version.
2. If the crate has a pre-release version, it is assumed that this
   version has the format pre.<d>, where <d> is the output of `git
   describe` with all dashes replaced by dots.
3. The name of the libnitrokey directory is libnitrokey-<tag>, where
   <tag> is the corresponding Git version tag.
4. libnitrokey uses version tags of the format v<maj>.<min>, where <maj>
   the major version and <min> is the minor version.

0 files changed, 0 insertions, 0 deletions