Trivial changes to prepare julODBC for packaging

The small changes made in this commit go most of the way towards making julODBC usable as a package once it's installed inside of `~/.julia`.

There is one hang-up: I don't seem to have access to `Base.c_malloc`. Once that's resolved, we could work on officially adding this package to Julia's package manager and getting it into more people's hands for testing.