Log Message:
pkgtools/pkglint: update to 21.2.2

Changes since 21.2.1:

Check the variable names of OPSYS-specific variables for typos, such as
'Dragonfly' with a lowercase 'f'.  Suggested by David A. Holland in
PR pkg/56352.

Warn if variables like CFLAGS are assigned using the operator '='.
Suggested by David A. Holland in PR pkg/56352.