Log Message:
pkgtools/pkglint: update to 5.7.0

Changes since 5.6.12:

* Many of the -C and -W command line options have been removed since
  they are not used in practice. The -Wall and -Call options continue
  to work though; these are the only options mentioned in the pkgsrc
  guide.

* When a PLIST file contains redundant libtool libraries (.la and the
  corresponding .so), there is only a single warning per file.

* Warnings about the package COMMENT are now strictly ordered from left
  to right.

* The hashes for all distfiles must now contain the SHA512 hash. This
  hash has been added to many distfiles in 2015. It's time now to
  enforce it on all other distfiles as well.

* Makefile fragments that are included inside an .elif exists(...)
  are not reported as missing.

* The check for redundant variables and accidentally overwritten
  variables has been improved. Now the warning occurs at the later
  definition. This especially applies to cases where a file is included
  and after that, some of its variables are overridden. Variables in
  unrelated files are no longer marked as redundant.

* When a package contains multiple definitions of a single variable
  (typical for Makefile.common), the later definition overrides the
  earlier definition. That way, the location of DISTINFO_FILE and
  PATCHDIR is resolved correctly.