Log Message:
Update pkglint to 5.5.7

Changes since 5.5.6:

* When pkglint warns about files that are accidentally executable, it
  offers to fix the file permissions.

* Warn about ${HOMEPAGE:=repository/}, since the := modifier should
  only be used with MASTER_SITES.

* When the distinfo file is missing, suggest setting NO_CHECKSUM.

* Several refactorings.