problems compiling virtio spec on Fedora 21

["Michael S. Tsirkin" <mst@redhat.com>]

Spec fails to build:
(/usr/share/texlive/texmf-dist/tex/latex/pgf/compatibility/pgfcomp-version-0-65
.sty
! Undefined control sequence.
\pgfsys@svg@newline ->\Hnewline 
                                
l.190   \pgfusepathqfill}
                         
? 
! Emergency stop.
\pgfsys@svg@newline ->\Hnewline 
                                
l.190   \pgfusepathqfill}

I filed a bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1180868

For now, the following patch to texlive seems to help:

--- /tmp/pgfsys-tex4ht.def	2015-01-11 13:14:18.089482204 +0200
+++ /usr/share/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsys-tex4ht.def	2015-01-11 12:59:09.288542620 +0200
@@ -86,7 +86,8 @@
 %     class="}{\%s}{-\%s}{x-x-\%d}{}{">}{</span>}
 %}
 
-\def\pgfsys@svg@newline{\Hnewline}
+% \def\pgfsys@svg@newline{\Hnewline}
+\def\pgfsys@svg@newline{{?nl}}
 
 % we don't want tex4ht putting <p> and </p> tags automatically in our svg code and causing invalid xhtml in our svg pictures
 \newif\ifpgfsys@CssIncluded@\pgfsys@CssIncluded@false