Log Message:
Updated pkglint to 5.4.0.

Changes since 5.3.7:

* Replaced the -D... debug options with a single -d
* Omitted duplicate diagnostics
* Marked the :Q operator unnecessary for some variables
* Improved detection of whether bsd.prefs.mk has been included,
  which fixed unwarranted warnings about load time evaluation of
  some variables like ${ECHO} and ${SED}
* Improved detection for $(VAR) with round parentheses
* Fixed allowed locations for several variables
* Improved detection for used variables (still not perfect)
* Added warning that MASTER_SITES should not be used in HOMEPAGE
* Fixed warning about manual patches not being in distinfo
* Added a check for missing MASTER_SITE_* variables
* Added a check for unfinished url2pkg work
* Fixed several wrong warnings