Fix handwritten check for SIOCGIFALIAS on FreeBSD
https://bugs.gentoo.org/900268
--- a/configure.ac
+++ b/configure.ac
@@ -413,6 +413,7 @@
     #include <stddef.h>
     #include <sys/types.h>
     #include <sys/socket.h>
+    #include <sys/ioctl.h>
     #ifdef HAVE_SYS_SOCKIO_H
     #include <sys/sockio.h>
     #endif