Auto merge of #1540 - gluxon:add-IFLA_INFO_, r=gnzlbg
Auto merge of #1540 - gluxon:add-IFLA_INFO_, r=gnzlbg

Add IFLA_INFO_ consts

See https://github.com/torvalds/linux/blob/54ecb8f7/include/uapi/linux/if_link.h#L354-L362

rust-lang/libc,rust-lang/libc,rust-lang/libc