Log Message:
pkgtools/pkglint: update to 20.2.6

Changes since 20.2.5:

Some selected absolute paths, such as /etc/passwd, /etc/shadow and
/etc/hosts are allowed in patch files.  Other files in /etc should still
use PKG_SYSCONFDIR, to keep the package portable between platforms and
also in unprivileged mode. (Fixes PR pkg/55524.)

Absolute pathnames are also allowed in C-style end-of-line comments
(fixes PR pkg/55516) and in continuations of C-style block comments
(fixes PR pkg/55524).

The explanation for make's :ts modifier has been adjusted to the 2020
bmake update.  The modifier :ts\040 is now interpreted as octal, as
opposed to decimal.