lua53-messagepack-0.3.3-bp154.1.20

- do not build for Lua 5.2

- Add %release to old package obsolete/provide as we still have
  the same version

- Switch to multibuild syntax

- Rename to lua-messagepack to be used by all namespaced variants

- Add documentation to the package.

- Fix source URL.

- Initial version based on devel:languages:lua/lua-messagepack