[PATCH] kbuild: restrain output of "make help" to 80 columns

This patch fixes the output of "make help" to fit in a 80 column
screen. Please push upstream as part of your other patches.

Signed-off-by: Yum Rayan <yum.rayan@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>