prior to this change, the build fails because the documentation cannot be
generated due to a missing latex package (probably fallout from a texlive
update):
! LaTeX Error: File `hypdoc.sty' not found.
Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)
Enter file name:
! Emergency stop.
<read *>
l.29 \begin{document}
^^M
! ==> Fatal error occurred, no output PDF file produced!
Transcript written on preview.log.
make[1]: *** [Makefile:91: preview.pdf] Error 1
make[1]: Leaving directory '/build/auctex-12.3/latex'
make: *** [Makefile:219: texmf] Error 2
cec3a44123