Include missing header files which define functions for which gcc has

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

usr.sbin/getextattr/getextattr.c

@@ -34,6 +34,7 @@
 
 #include <libutil.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <vis.h>
 

usr.sbin/jail/jail.c

@@ -11,6 +11,8 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <err.h>
 #include <sys/types.h>
 #include <sys/jail.h>

usr.sbin/mtest/mtest.c

@@ -5,8 +5,14 @@
  * Written by Steve Deering, Stanford University, February 1989.
  */
 
+#ifndef lint
+static const char rcsid[] =
+  "$FreeBSD$";
+#endif /* not lint */
+
 #include <err.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/time.h>

usr.sbin/pw/rm_r.c

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

usr.sbin/quotaon/quotaon.c

@@ -58,6 +58,7 @@ static const char rcsid[] =
 #include <err.h>
 #include <fstab.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 

usr.sbin/setextattr/setextattr.c

@@ -35,6 +35,8 @@
 
 #include <libutil.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 void
 usage(void)

usr.sbin/vnconfig/vnconfig.c

@@ -13,6 +13,7 @@ static const char rcsid[] =
 #endif /* not lint */
 
 #include <stdio.h>
+#include <stdlib.h>
 
 int
 main(int argc, char **argv)

usr.sbin/yppoll/yppoll.c

@@ -38,6 +38,7 @@ static const char rcsid[] =
 #include <sys/socket.h>
 #include <err.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <time.h>
 #include <unistd.h>