make pdfdoc errors with v4.9

[Jim Davis]

On my Ubuntu 16.04 desktop, make pdfdocs fails with

Makefile:58: recipe for target 'media.pdf' failed
make[2]: *** [media.pdf] Error 1
Documentation/Makefile.sphinx:79: recipe for target 'pdfdocs' failed
make[1]: *** [pdfdocs] Error 2
Makefile:1450: recipe for target 'pdfdocs' failed
make: *** [pdfdocs] Error 2

jim@krebstar:~/linux-rc$ grep 'LaTeX Error' /tmp/make-pdfdocs.txt |
sort | uniq -c
      1 ! LaTeX Error: \begin{document} ended by \end{adjustbox}.
      1 ! LaTeX Error: \begin{document} ended by \end{longtable}.
      1 ! LaTeX Error: \DUrole undefined.
    240 ! LaTeX Error: Something's wrong--perhaps a missing \item.
      2 ! LaTeX Error: There's no line here to end.

This is using the distro's versions of sphinx (1.3.1) and xetex:

This is XeTeX, Version 3.14159265-2.6-0.99992 (TeX Live 2015/Debian)
(preloaded format=xelatex)

-- 
Jim