add new IPV6_AUTOFLOWLABEL socket option in netinet/in.h
add new IPV6_AUTOFLOWLABEL socket option in netinet/in.h

added in linux v3.17 commit 753a2ad54ef45e3417a9d49537c2b42b04a2e1be
enables automatic flow label generation on transmit

chardi/musl,chardi/musl,chardi/musl