New upstream release. Please signoff.

Anybody ever heard of the mentioned "libpipeline"? It seems so far it
hasn't been packaged in any form for Arch. I'll have to bring this in
when 2.6.0 comes out.

-Andy

Changes:

This release reduces installation footprint by building much of man-db
as shared libraries, and permits building with an external libpipeline
(http://libpipeline.nongnu.org/). man-db 2.6.0 will stop shipping its
own copy of libpipeline. Among other things, this release fixes an
assertion failure on 'man -l', fixes catman saving corrupted pages in
some locales, and prevents mandb from repeatedly rescanning manual page
hierarchies on every run when a whatis entry turns into a broken link.