ssh: diff reduction against OpenBSD, remove unused includes

These appear to be leftovers from ca86bcf253 and f7167e0ea0

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

(cherry picked from commit 154adbbeb8)

crypto/openssh/misc.c

@@ -30,7 +30,6 @@
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
-#include <sys/sysctl.h>
 #include <sys/time.h>
 #include <sys/wait.h>
 #include <sys/un.h>

crypto/openssh/sshconnect.c

@@ -27,7 +27,6 @@ __RCSID("$FreeBSD$");
 #include <net/if.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include <rpc/rpc.h>
 
 #include <ctype.h>
 #include <errno.h>