Move `lib/support.rs` to zinc crate -

As discussed in #106, this removes a bunch of functions that are no
longer needed and only keeps the ones it doesn't compile with. It's been
verified that there no symbols pulled into the ELFs from anywhere that
would be the same as the ones removed by this change.
Merge pull request #119 from errordeveloper/move_libsupport

Move `lib/support.rs` to zinc crate