Remove the workaround for the gcc bug 41933?

[Chandlerooo]

I notice there are some workarounds in defer.hpp, dispatch.hpp and deferred.hpp:
https://github.com/3rdparty/libprocess/blob/main/include/process/defer.hpp
https://github.com/3rdparty/libprocess/blob/main/include/process/deferred.hpp
https://github.com/3rdparty/libprocess/blob/main/include/process/dispatch.hpp
like

// Due to a bug (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41933)
// with variadic templates and lambdas, we still need to do
// preprocessor expansions. In addition, due to a bug with clang (or
// libc++) we can't use std::bind with a std::function so we have to
// explicitly use the std::function<R(P...)>::operator() (see
// http://stackoverflow.com/questions/20097616/stdbind-to-a-stdfunction-crashes-with-clang).
...
      lambda::partial(                                               \
           &std::function<void(ENUM_PARAMS(N, P))>::operator(),         \
           std::function<void(ENUM_PARAMS(N, P))>(),                    \
           ENUM(N, FORWARD_A, _)       

This compiler bug is marked as fixed : https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41933
Shall this workaround be removed? Does this bug still exist?