Log Message:
Updated pkglint to 5.4.16.

Changes since 5.4.15:

* updated vardefs from mk/defaults/mk.conf from v1.118 (2006) to v1.269
  Gone:
  * PKG_SUFX
  * USETBL
  * PKGSRC_SHOW_PATCH_ERRORMSG
  * USE_XPKGWEDGE
  * PKGVULNDIR
  Adjusted:
  * USE_GAMESGROUP
  * BIN_INSTALL_FLAG -> BIN_INSTALL_FLAGS

* fixed license parsing to be more realistic
  (the previous version didn't handle parentheses correctly)

* lots of housekeeping
  * moved some code to separate packages, allowing re-use
  * separated Line checks into LineChecker type
  * separated MkLine checks into MkLineChecker type
  * made Line an interface, for further refactorings