Update riak to 2.0.2.

- Clean up and simplify Makefile.
- Add an SMF manifest.
- Remove innostore option, doesn't seem to be maintained for recent OTP
- Remove some unneeded patching.

Upstream changes since 1.4.6 too numerous, please see the release notes:

  http://docs.basho.com/riak/2.0.2/intro-v20/

The upgrade guide:

  http://docs.basho.com/riak/2.0.2/upgrade-v20/