Fix some undeclared functions

by adding the proper #includes.
gcc warned with "warning: incompatible implicit declaration of built-in
function 'foo'".

src/dpsup.c

@@ -40,6 +40,7 @@ static int decosfcclossage;
 #if KLH10_DEV_DP		/* Moby conditional for entire file */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>		/* For strerror() if present */
 
 #include "dpsup.h"

src/dvuba.c

@@ -48,6 +48,7 @@ static int decosfcclossage;
 #if KLH10_CPU_KS	/* Moby conditional for entire file */
 
 #include <stdio.h>	/* For stderr if buggy */
+#include <string.h>
 
 #include "kn10def.h"
 #include "kn10ops.h"

src/enaddr.c

@@ -52,6 +52,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
 

src/osdsup.c

@@ -44,6 +44,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>	/* For strrchr */
 
 #include "klh10.h"