exempi: Fix install falure, update sha1sum of patch

Content of the patch this formula use:
  http://cgit.freedesktop.org/exempi/patch/?id=75af16b221dca0bf6a9656d5b187c3141d82c200
might have changed since last update.
exempi: bump version up to 2.2.2, remove patch
exempi: add 2.2.2 bottle.