Auto merge of #2224 - kolapapa:master, r=JohnTitor

Add AF_VSOCK to uclibc mips

https://github.com/kraj/uclibc-ng/blob/master/libc/sysdeps/linux/common/bits/socket.h#L131

Author: bors

Diff for: src/unix/linux_like/linux/uclibc/mod.rs

@@ -41,6 +41,8 @@ pub const MCL_FUTURE: ::c_int = 0x0002;
 
 pub const SIGEV_THREAD_ID: ::c_int = 4;
 
+pub const AF_VSOCK: ::c_int = 40;
+
 pub const ADFS_SUPER_MAGIC: ::c_long = 0x0000adf5;
 pub const AFFS_SUPER_MAGIC: ::c_long = 0x0000adff;
 pub const AFS_SUPER_MAGIC: ::c_long = 0x5346414f;