Log Message:
"install -dc foo bar" doesn't copy foo to bar, it creates two directories
foo and bar. On NetBSD, it doesn't matter whether foo already exists or
whether it is a directory, so the passed flags just created a bunch of
garbage directories. Since I don't want to patch a dozen Makefile.ams to
avoid the nobase usage, just precreate the directories in pre-install.
Bump revision.