Log Message:
Fixed some things that are not yet pkglint warnings:

- Moved the .include lines to the bottom of the file, as they are not
  needed at the top.
- Replaced a horribly complicated expression, which was equivalent to
  ${PKGBASE}, with a literal "bsfilter", as it is used in a context where
  a file name is expected, not a package name.
- Made the .for iteration variable names lowercase.