chore, PEBKAC, use version strings from version.mk in info/ subdir too

This changeset is to make man pages display the correct version at the bottom.

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
bump, release v0.2.5 is imminent

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Reverse-bump, v0.2.5 released, go back to devel series

This reverts commit 87b470b07e911eefaec61bbb26ba1e2e3291854e.