If a manpath directory (for example, a _whatdb entry from man.conf(5)

or an entry in the MANPATH environment variable) does not exist,
silently skip it.  This brings makewhatis(8) back closer to the
behaviour of espie@'s version and ought to shut up the weekly(8)
whining observed by henning@ on machines not having xbase installed.
Also, don't error out after the first unusable manpath entry, still
try the others.

Of course, still complain about non-existent directories specified
on the command line and about any directories failing for other
reasons than ENOENT.

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