Fix some compilation warnings on older systems

* print_statfs.c (print_statfs_flags): Define only
for [HAVE_STRUCT_STATFS_F_FLAGS || HAVE_STRUCT_STATFS64_F_FLAGS].
* tests/inet-cmsg.c (print_origdstaddr): Define only
for [IP_ORIGDSTADDR].
diff --git a/print_statfs.c b/print_statfs.c
index d5478eb..2661d07 100644
--- a/print_statfs.c
+++ b/print_statfs.c
@@ -41,6 +41,7 @@
 		tprintf("%#llx", magic);
 }
 
+#if defined HAVE_STRUCT_STATFS_F_FLAGS || defined HAVE_STRUCT_STATFS64_F_FLAGS
 static void
 print_statfs_flags(const char *const prefix, const unsigned long long flags)
 {
@@ -49,6 +50,7 @@
 		printflags64(statfs_flags, flags, "ST_???");
 	}
 }
+#endif /* HAVE_STRUCT_STATFS_F_FLAGS || HAVE_STRUCT_STATFS64_F_FLAGS */
 
 static void
 print_statfs_number(const char *const prefix, const unsigned long long number)
diff --git a/tests/inet-cmsg.c b/tests/inet-cmsg.c
index d21d5d2..7e4e0c9 100644
--- a/tests/inet-cmsg.c
+++ b/tests/inet-cmsg.c
@@ -75,6 +75,7 @@
 	}
 }
 
+#ifdef IP_ORIGDSTADDR
 static void
 print_origdstaddr(const struct cmsghdr *c)
 {
@@ -84,6 +85,7 @@
 	printf("IP_ORIGDSTADDR, {sa_family=AF_INET, sin_port=htons(%u)"
 	       ", sin_addr=inet_addr(\"127.0.0.1\")}", ntohs(sin->sin_port));
 }
+#endif
 
 int
 main(void)