Log Message:
pkgtools/pkglint: update to 5.7.16

Changes since 5.7.15:

* Completely rewrote the code for aligning multiple variable assignment
  lines. It works on the actual lines of the file now instead of the
  parsed lines. This provides more exact diagnostics and also makes the
  handling of these lines easier so that future requirements can be
  implemented more easily.

* Added support for exotic conditions in .if clauses. These conditions
  are not seen in the wild though.

* Fixed wrong diagnostics for ALTERNATIVES files that appear
  conditionally in the PLIST.

* As always: lots of refactorings and newly added tests.