refactor: remove boost.spirit graphviz parser

Author: Becheler

CMakeLists.txt

@@ -43,7 +43,6 @@ target_link_libraries(boost_graph
     Boost::random
     Boost::range
     Boost::serialization
-    Boost::spirit
     Boost::throw_exception
     Boost::tuple
     Boost::type_traits

build.jam

@@ -32,7 +32,6 @@ constant boost_dependencies :
     /boost/random//boost_random
     /boost/range//boost_range
     /boost/serialization//boost_serialization
-    /boost/spirit//boost_spirit
     /boost/throw_exception//boost_throw_exception
     /boost/tuple//boost_tuple
     /boost/type_traits//boost_type_traits