[wip/py-dynamic-graph-tutorial] add patch-aa to fix compilation with sphinx >= 1.8

py-dynamic-graph-tutorial/distinfo

 SHA1 (dynamic-graph-tutorial-1.1.1.tar.gz) = 45b23da4ad9fbac1e3eb5fe097c145b7d5079794
 RMD160 (dynamic-graph-tutorial-1.1.1.tar.gz) = 50c7accf6656b54162f642398ce76f886cefcf98
 Size (dynamic-graph-tutorial-1.1.1.tar.gz) = 773815 bytes
+SHA1 (patch-aa) = c64971cf8d1c18b3e0224dd58b40f97c1cd24e6f

py-dynamic-graph-tutorial/patches/patch-aa

+[Doc][Sphinx] Use imgmath with sphinx >= 1.4, as pngmath has been removed in 1.8
+
+--- doc/sphinx/conf.py.in
++++ doc/sphinx/conf.py.in
+@@ -19,13 +19,14 @@ import sys, os
+ sys.path = [os.path.abspath('@CMAKE_BINARY_DIR@/src')]+sys.path
+ sys.path = [os.path.abspath('@CMAKE_SOURCE_DIR@/src')]+sys.path
+ 
+-import dynamic_graph.tutorial as dgt
++from sphinx import version_info as sphinx_version
+ 
+ # -- General configuration -----------------------------------------------------
+ 
+ # Add any Sphinx extension module names here, as strings. They can be extensions
+ # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
+-extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.intersphinx', 'sphinx.ext.todo', 'sphinx.ext.pngmath']
++extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.intersphinx', 'sphinx.ext.todo']
++extensions.append('sphinx.ext.pngmath' if sphinx_version < (1, 4) else 'sphinx.ext.imgmath')
+ 
+ # Add any paths that contain templates here, relative to this directory.
+ templates_path = ['_templates']
+