Update distinfo

• Bump PORTREVISION for package change

Upstream rerolled the tarball.
Around 5,000 lines of differences are tab/space changes.

The original tarball is available at https://people.freebsd.org/~sunpoet/cabextract/cabextract-1.9.tar.gz
The diff -bru result is available at https://people.freebsd.org/~sunpoet/cabextract/cabextract.diff