Fix builds by including linux/rtnetlink.h and linux/if_addr.h

Author: jbaublitz

libc-test/build.rs

@@ -2358,6 +2358,7 @@ fn test_linux(target: &str) {
         "linux/futex.h",
         "linux/fs.h",
         "linux/genetlink.h",
+        "linux/if_addr.h"
         "linux/if_alg.h",
         "linux/if_ether.h",
         "linux/if_tun.h",
@@ -2368,6 +2369,7 @@ fn test_linux(target: &str) {
         "linux/netfilter_ipv6.h",
         "linux/netlink.h",
         "linux/random.h",
+        "linux/rtnetlink.h"
         "linux/seccomp.h",
         "linux/sockios.h",
     }