Uses boost_workaround files

This fixes bug where boost overlay files were not being used, when not
compiling from source dir.

configure.ac

@@ -260,7 +260,7 @@ AC_SUBST(CPPFLAGS)
 AC_SUBST(CXXFLAGS)
 
 # CPP flags for submodules
-[MOD_CPPFLAGS="-I\$(srcdir) -I\$(srcdir)/.. -I\$(srcdir)/../boost-workaround \
+[MOD_CPPFLAGS="-I\$(srcdir) -I\$(srcdir)/.. -I\$(srcdir)/../../boost-workaround \
 -DHAVE_CONFIG_H"]
 AC_SUBST(MOD_CPPFLAGS)
 

src/boost-workaround/boost/graph/betweenness_centrality.hpp

@@ -25,6 +25,7 @@
 #include <boost/property_map.hpp>
 #include <boost/graph/named_function_params.hpp>
 #include <algorithm>
+#include <boost/vector_property_map.hpp>
 
 namespace boost {