Update to 1.865
- New upstream release 1.865
- Bug fix for two-way IPC stalling on Windows in MCE::Channel::Threads:
see https://www.perlmonks.org/?node_id=11110612
- Remove the check for MSWin32 in MCE::Channel::Mutex; MCE::Channel since
the 1st release silently defaults to MCE::Channel::Threads on Windows
- Small tweak to MCE::Signal