Include workaround for push_relabel_max_flow(), wich disables some assert() calls

src/graph/Makefile.am

@@ -40,7 +40,8 @@ libgraph_tool_core_la_SOURCES = \
     ../boost-workaround/boost/graph/overloading.hpp\
     ../boost-workaround/boost/graph/isomorphism.hpp\
     ../boost-workaround/boost/graph/fruchterman_reingold.hpp\
-    ../boost-workaround/boost/graph/kamada_kawai_spring_layout.hpp
+    ../boost-workaround/boost/graph/kamada_kawai_spring_layout.hpp\
+    ../boost-workaround/boost/graph/push_relabel_max_flow.hpp
 
 libgraph_tool_core_la_includedir = $(pythondir)/graph_tool/include
 libgraph_tool_core_la_include_HEADERS = \