Cope on machines without INADDR_LOOPBACK.

rsync.h

@@ -486,6 +486,13 @@ extern int errno;
 # define NONBLOCK_FLAG FNDELAY
 #endif
 
+#ifndef INADDR_LOOPBACK
+#define INADDR_LOOPBACK 0x7f000001
+#endif
+
+#ifndef INADDR_NONE
+#define INADDR_NONE 0xffffffff
+#endif
 
 #define IS_DEVICE(mode) (S_ISCHR(mode) || S_ISBLK(mode) || S_ISSOCK(mode) || S_ISFIFO(mode))