Include missing header files which define functions for which gcc has

builtins (e.g., exit, strcmp).

bin/cat/cat.c

@@ -57,6 +57,7 @@ static const char rcsid[] =
 #include <locale.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 int bflag, eflag, nflag, sflag, tflag, vflag;

bin/pax/pax.c

@@ -61,6 +61,7 @@ static const char rcsid[] =
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include "pax.h"
 #include "extern.h"

bin/sh/error.c

@@ -55,6 +55,7 @@ static const char rcsid[] =
 #include "show.h"
 #include "trap.h"
 #include <signal.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
 

sbin/badsect/badsect.c

@@ -67,6 +67,7 @@ static const char rcsid[] =
 #include <paths.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 union {

sbin/comcontrol/comcontrol.c

@@ -37,6 +37,7 @@ static const char rcsid[] =
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/ioctl.h>

sbin/dumpon/dumpon.c

@@ -47,6 +47,8 @@ static const char rcsid[] =
 
 #include <err.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <sys/param.h>
 #include <sys/sysctl.h>

sbin/kldload/kldload.c

@@ -31,6 +31,7 @@ static const char rcsid[] =
 
 #include <err.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <sys/param.h>
 #include <sys/linker.h>

sbin/md5/md5.c

@@ -28,6 +28,7 @@ static const char rcsid[] =
 #include <stdio.h>
 #include <time.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <string.h>
 
 /*

sbin/mount/mount_ufs.c

@@ -51,6 +51,7 @@ static const char rcsid[] =
 #include <err.h>
 #include <errno.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 
 #include <ufs/ufs/ufsmount.h>

sbin/mount_std/mount_std.c

@@ -51,6 +51,7 @@ static const char rcsid[] =
 
 #include <err.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sysexits.h>
 #include <unistd.h>

sbin/mount_umapfs/mount_umapfs.c

@@ -56,6 +56,7 @@ static const char rcsid[] =
 
 #include <err.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sysexits.h>
 #include <unistd.h>

sbin/reboot/reboot.c

@@ -55,6 +55,7 @@ static const char rcsid[] =
 #include <pwd.h>
 #include <syslog.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 

sbin/restore/main.c

@@ -55,6 +55,7 @@ static const char rcsid[] =
 #include <paths.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "restore.h"

sbin/restore/utilities.c

@@ -47,6 +47,7 @@ static const char rcsid[] =
 
 #include <errno.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 

sbin/spppcontrol/spppcontrol.c

@@ -40,6 +40,7 @@ static const char rcsid[] =
 
 #include <err.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sysexits.h>
 #include <unistd.h>

sbin/swapon/swapon.c

@@ -49,6 +49,7 @@ static const char rcsid[] =
 #include <errno.h>
 #include <fstab.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>