fix last patch

* nextstep/Makefile.in (links): Use abs_top_builddir et al; link over DOC.
Make it easier to use mailcap for viewing single files

* mailcap.el (mailcap-mime-data): Add doc-view-mode as a viewer for
PDFs.
(mailcap-view-mime): New function.
Make eww use mailcap when displaying PDF files

Fixes: debbugs:19270

* net/eww.el (eww-display-pdf): Let mailcap determine how to
display PDF files.
* eww.texi (Basics): Document eww PDF viewing.
* NEWS: Add some doc markers to the eww stuff.