Fix #2165: Remove faulty and non-need conditional

sphinx/texinputs/sphinx.sty

@@ -58,11 +58,10 @@
 %\renewcommand{\paperwidth}{7in}     % O'Reilly ``Programmming Python''
 
 % use pdfoutput for pTeX and dvipdfmx
+% when pTeX (\kanjiskip is defined), set pdfoutput to evade \include{pdfcolor}
 \ifx\kanjiskip\undefined\else
-  \ifx\Gin@driver{dvipdfmx.def}\undefined\else
   \newcount\pdfoutput\pdfoutput=0
 \fi
-\fi
 
 \RequirePackage{graphicx}