This is a autoconf based bzip2 source. It makes easy to correctly build
shared libraries on all supported platforms.

Differences between variants:

for_downstream
- Versions are 1.0.u
- Includes README.autotools
- Do not package upstream files that become obsolete.

for_upstream
- Versions are 1.0.u.d
- Does not include README.autotools
- Remove upstream files that become obsolete.

tarballs:
- Versions are 1.0.u.0.d
- Includes README.autotools
- Do not package upstream files that become obsolete.