Upgrade to JNA 4.0

[ryantxu]

Here is a patch to upgrade to JNA 4.0

It also updates the junit and guava deps while we are at it.

Let me know if I can do anything to make this easier.

thanks
ryan

[dblock]

Merged in 2551226, thank you. Much appreciated, great work.

A few things for next time:

• Try to make squashed and/or rebased pull requests for a single feature or bug, this just aggregates all commits together, avoids useless "merged from xyz" commits. Read up on those.
• Don't work on master, create a topic branch off master before you start doing work. Make pull requests from the branch. Typically this means:

git checkout master
git pull upstream master
git checkout -b new-branch
...
git push origin new-branch

I made a squashed merge, so now you have to rewind your master. Most likely this is:

git checkout master
# save any current changes
git checkout -b my-current-changes
git checkout master
# reset back 10 commits
git reset HEAD~10
# sync from master
git pull upstream master
# force push to github, overwriting any changes (my-current-changes will still have your code, just in case)
git push origin master -f

• Update CHANGELOG.