Revert "Fix libssl dependency."

Actually, buildpacks (e.g. the Ruby one) are hardcoded against libssl0.9.8.
This reverts commit 9ea27cbc47a46fd5b456fd9e0952d5e85f3527a8.
Reverting back to libssl0.9.8.

Users of debian wheezy will need to install libssl0.9.8 manually if they wish to use that distribution.
Remove debian wheezy from the list of fully supported distributions.