doc: add graphviz imagemagick as build dependencies
'make htmldocs' requires graphviz and imagemagick (at least with Sphinx
3.5.4).
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>
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'make htmldocs' requires graphviz and imagemagick (at least with Sphinx
3.5.4).
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>