Remove md5sums array from osmconvert package.
Update ruby-adsf package

Numerous changes were made. Highlights:

* Change `pkgrel` from 1 to 2.
* Add option `!emptydirs`. This prevents makepkg from creating packages with
  empty directories, thus silencing a namcap warning.
* Remove md5sums and sha1sums array, and add sha256sums array.
* Do not use _gemdir variable. (it was only being used once)
* Change variable _gemname to _pkgname, to be more consistent with other
  packages I (Jeremy "Ichimonji10" Audet) maintain.
* Change some double quotes to single quotes, and remove some quotes entirely.
* Add comments.