Don't use MANDEPEND. It hasn't had anything to do with dependencies for
5-6 years, but is still being used, mainly in groff/*/Makefile, where it
amounts to just a macro giving the list of generated man pages. Since
all man pages in groff are generated (from .man to .[1-9]), it's simpler
to use the source names ({$MANX}) to give the list.
Fixed some other style bugs.