Auto merge of #378 - japaric:mips, r=alexcrichton
Auto merge of #378 - japaric:mips, r=alexcrichton

mips: add SO_REUSEPORT

Which is required to cross compile the net2 crate. Which, in turn, is required to cross compile Cargo.

r? @alexcrichton

rust-lang-nursery/libc,philippkeller/libc,cactorium/libc,rust-lang/libc,zethra/libc,anatol/libc,zethra/libc,anatol/libc,mneumann/libc,rust-lang-nursery/libc,mneumann/libc,cactorium/libc,philippkeller/libc,anatol/libc,rust-lang/libc,superriva/libc,cactorium/libc,rust-lang-nursery/libc,superriva/libc,zethra/libc,philippkeller/libc,mneumann/libc,superriva/libc,rust-lang/libc