Eli Schwartz authored Mar 14, 2018 and Allan McRae committed Mar 15, 2018

Currently the only things we check are:

- Things that should be arrays, are not strings, and vice versa (this
  was mostly copy-pasted from the similar code in lint_pkgbuild).
- Variables that are meant to contain pathname components cannot contain
  a newline character, because newline characters in pathnames are weird
  and also don't play well with future changes intended for the
  --packagelist option.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>