prep for 4.0.5 SOVERSION change

	modified:   lib/POEx/ZMQ/FFI.pm
micro-optimizations

	modified:   lib/POEx/ZMQ/FFI/Role/ErrorChecking.pm
	modified:   lib/POEx/ZMQ/Socket.pm
POD, drop some deprecated comments

	modified:   lib/POEx/ZMQ/Socket.pm
minor Role::ErrorChecking optimizations

	modified:   lib/POEx/ZMQ/FFI/Role/ErrorChecking.pm
minor optimizations

	modified:   lib/POEx/ZMQ/Socket.pm