Is isSourceFilterSupported still needed on AIX builds?

[Alan Bateman]

Christoph, or others maintaining the AIX port: Do you know if 
isSourceFilterSupported in libnio/ch/Net.c is still needed? It looks 
like it is only needed on AIX releases prior to 6.1. I don't know 
anything about AIX releases but the wikipedia pages suggest the release 
prior to 6.1 ended service updates in 2012. I'm wondering if this code 
can be removed.

Thanks.

-Alan.