Log Message:
pkgtools/pkglint: update to 23.4.0

Changes since 23.3.0 from 2024-01-12:

Add riscv64 to the list of known hardware architectures.

Suggest removing parentheses around complete conditions.

Warn about duplicate DESCR files, except when one of the packages is in
pkgsrc-wip and the other is in main pkgsrc.

Fix crash when parsing '.ifndef VAR'.