It is handled by each project's rebar.config.script now.
When building riak's source tarball, `git archive` is used to ensure clean repositories are used rather than working directories that might have uncommited changes. This works fine except for one special case where eleveldb downloads leveldb into its source tree. In this case 'git archive' then removes the leveldb source because it is not truly a committed file in eleveldb's repository. The side effect of this issue are users who try to build riak from source while either offline or without access to github while building. Any build will fail because eleveldb does not have leveldb's source tree that is needed. This commit fixes that by using a work around to `git archive` in the one special case of eleveldb. The `.git` directories are still cleaned, but the leveldb source tree is left intact. The one downside to this change is eleveldb is not treated differently than every other repository and local changes to eleveldb's source tree can possibly leak into the source tarball. This however is very unlikely due to `make dist` using a completely separate `make deps` chain than the standard developer `make deps`. Basically someone would have to really try hard to mess it up. This addresses basho/riak#345