libcap for kernel-2.6 and beyond

Links:

- Signed tarballs: https://mirrors.edge.kernel.org/pub/linux/libs/security/linux-privs/libcap2/
- Release site: https://sites.google.com/site/fullycapable/
- Git repository: https://web.git.kernel.org/pub/scm/libs/libcap/libcap.git/