Make --lib-version work again.
* src/gpg-error.c (main): Add printing code.
This was lost while changing to the included option parser back in
- The new code also does some prettying of the output.
- Fixes-commit: 11ce9bc3d6fe75859e18112824ae7ec3ca0fc8df
- Signed-off-by: Werner Koch <wk@gnupg.org>