Patch from Firefox ESR 38 Void packaging.
--- mozilla/media.orig/mtransport/third_party/nICEr/src/stun/addrs.c
+++ mozilla/media/mtransport/third_party/nICEr/src/stun/addrs.c
@@ -45,7 +45,6 @@
 #include <sys/param.h>
 #include <sys/socket.h>
 #ifndef ANDROID
-#include <sys/sysctl.h>
 #include <sys/syslog.h>
 #else
 #include <syslog.h>