Bug 1555589 - Include sys/prctl.h not linux/prctl.h. r=jld

Differential Revision: https://phabricator.services.mozilla.com/D33517

--HG--
extra : moz-landing-system : lando

security/sandbox/linux/SandboxFilter.cpp

@@ -24,11 +24,11 @@
 #include <linux/ioctl.h>
 #include <linux/ipc.h>
 #include <linux/net.h>
-#include <linux/prctl.h>
 #include <linux/sched.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
+#include <sys/prctl.h>
 #include <sys/socket.h>
 #include <sys/syscall.h>
 #include <sys/un.h>