Remove empty #ifdef and #ifndef blocks

[Frederic Cambus]

Hi tech@,

It seems some #ifdef and #ifndef blocks are no longer necessary.

Comments? OK?

Index: sys/netinet/ip_spd.c
===================================================================
RCS file: /cvs/src/sys/netinet/ip_spd.c,v
retrieving revision 1.90
diff -u -p -r1.90 ip_spd.c
--- sys/netinet/ip_spd.c        15 Sep 2016 02:00:18 -0000      1.90
+++ sys/netinet/ip_spd.c        27 Sep 2016 09:25:39 -0000
@@ -38,10 +38,6 @@
 #include <netinet/ip.h>
 #include <netinet/ip_var.h>
 #include <netinet/in_pcb.h>
-
-#ifdef INET6
-#endif /* INET6 */
-
 #include <netinet/ip_ipsp.h>
 #include <net/pfkeyv2.h>
 
Index: usr.bin/ftp/extern.h
===================================================================
RCS file: /cvs/src/usr.bin/ftp/extern.h,v
retrieving revision 1.44
diff -u -p -r1.44 extern.h
--- usr.bin/ftp/extern.h        20 Aug 2016 20:18:42 -0000      1.44
+++ usr.bin/ftp/extern.h        27 Sep 2016 09:25:39 -0000
@@ -101,8 +101,6 @@ void        ptransfer(int);
 void   recvrequest(const char *, const char *, const char *,
            const char *, int, int);
 char   *remglob(char **, int, char **);
-#ifndef SMALL
-#endif /* !SMALL */
 off_t  remotesize(const char *, int);
 time_t remotemodtime(const char *, int);
 void   reset(int, char **);