am 666d06fe: Merge "Backwards and forwards compatibility for an upcoming <sys/socket.h> change."

* commit '666d06fee9e1d2e1401a4b42d94d01e8f38ad1a5':
  Backwards and forwards compatibility for an upcoming <sys/socket.h> change.
diff --git a/libc/include/sys/un.h b/libc/include/sys/un.h
index 973861f..f89ead3 100644
--- a/libc/include/sys/un.h
+++ b/libc/include/sys/un.h
@@ -28,6 +28,9 @@
 #ifndef _SYS_UN_H_
 #define _SYS_UN_H_
 
+#include <sys/_types.h>
+typedef __sa_family_t sa_family_t;
+
 #include <linux/un.h>
 
 #endif /* _SYS_UN_H_ */