Log Message:
pkgtools/pkglint: update to 5.6.2

Changes since 5.6.1:

* Improved checks that depend on whether bsd.prefs.mk is included or
  not.

* Improved checks for tools, whether they may be used at load time
  or at run time.

* Improved tokenizer for shell commands. $| is not a variable but a
  dollar followed by a pipe.

* Warnings about SUBST context are now shown by default.

* A warning is shown when a SUBST block is declared for *-configure
  but the package has defined USE_CONFIGURE=no.

* Don't warn about USE_TOOLS:= ${USE_TOOLS:Ntool}.

* Don't warn about using the ?= operator in buildlink3.mk files before
  including bsd.prefs.mk (for some more variables, but not all).

* Report an error for packages from main pkgsrc that have a TODO or
  README file. Packages should be simple enough that they don't need
  a README file and ready for production so that they don't need a TODO.

* Lots of small bug fixes and new tests.