Fix compilation of userland stack.
This fixes
@@ -1213,7 +1213,7 @@ struct xsctp_inpcb {
#if defined(__Windows__)
uint16_t padding;
#endif
-#if !(defined(__FreeBSD__) && (__FreeBSD_version < 1001517))
+#if defined(__FreeBSD__)
uint16_t __spare16;
kvaddr_t socket;
#endif
