compile break in 1.85.0.beta1 when using favor_compile_time

[ChristophStrehle]

When instantiating the boost::msm::back::state_machine template with the boost::msm::back::favor_compile_time back end I get the following compile break:

boost\msm\back\metafunctions.hpp(651,50): error C2039: 'as_vector': is not a member of 'boost::fusion::result_of'

[henry-ch]

fixed in develop. Will request merge into 1.85 master.