Auto merge of #1605 - zvirja:fix-mipsel-unknown-linux-uclibc, r=gnzlbg

Add ucred and socket related types to uclibc-mips32

Fix compilation of the [tokio](https://github.com/tokio-rs) rust for MIPS architecture when using uClibc. Added missed types, which are defined in library headers:
https://github.com/kraj/uClibc/blob/ca1c74d67dd115d059a875150e10b8560a9c35a8/libc/sysdeps/linux/common/bits/socket.h#L320
https://github.com/kraj/uClibc/blob/ca1c74d67dd115d059a875150e10b8560a9c35a8/libc/sysdeps/linux/common/bits/in.h#L35-L36
https://github.com/kraj/uClibc/blob/ca1c74d67dd115d059a875150e10b8560a9c35a8/libc/sysdeps/linux/common/bits/in.h#L140-L143

Should also solve https://github.com/rust-lang-nursery/net2-rs/issues/88

Revisit of #1500