Fix conan boost_python version problem

conanfile.py

@@ -48,6 +48,7 @@ class ProjectPhoenix(ConanFile):
 
     def configure(self):
        self.options["boost"].header_only = True
+       self.options["boost_python"].python_version = 2.7
        self.options["freeimage"].shared = True
        self.options["glew"].shared = True
        self.options["gl"].shared = False