Auto merge of #698 - ndusart:in_addr_t, r=alexcrichton
Auto merge of #698 - ndusart:in_addr_t, r=alexcrichton

change type of INADDR constants to in_addr_t

These should be `in_addr_t` (u32) instead of `c_int`

This is a breaking change but it is just breaking newlib platforms for now.

@alexcrichton Do you prefer that I split the definition in submodules, to keep `c_int` in newlib and update the others ?

rust-lang-nursery/libc,cactorium/libc,rust-lang-nursery/libc,mneumann/libc,rust-lang-nursery/libc,rust-lang/libc,rust-lang/libc,cactorium/libc,cactorium/libc,rust-lang/libc,mneumann/libc,mneumann/libc