docs-rst: fix LaTeX \DURole renewcommand with Sphinx 1.3+
PDF build on Kernel 4.9-rc? returns an error with Sphinx 1.3.x and Sphinx 1.4.x, when trying to solve some cross-references. The solution is to redefine the \DURole macro. However, this is redefined too late. Move such redefinition to LaTeX preamble and bind it to just the Sphinx versions where the error is known to be present. Tested by building the documentation on interactive mode: make PDFLATEX=xelatex -C Documentation/output/./latex Fixes: e61a39ba ("[media] index.rst: Fix LaTeX error in interactive mode on Sphinx 1.4.x") Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: NJonathan Corbet <corbet@lwn.net>
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