fix implicit function decl warnings

by David J Cozatt

--- bin86-0.16.18/ld/catimage.c	
+++ bin86-0.16.18/ld/catimage.c	
@@ -21,6 +21,8 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include "x86_aout.h"
 
 #ifndef __OUT_OK
--- bin86-0.16.18/ld/dumps.c	
+++ bin86-0.16.18/ld/dumps.c
@@ -6,6 +6,7 @@
 #include "obj.h"
 #include "type.h"
 #include "globvar.h"
+#include <string.h>
 
 /* print list of modules and whether they are loaded */
 
--- bin86-0.16.18/ld/objchop.c	
+++ bin86-0.16.18/ld/objchop.c	
@@ -1,5 +1,6 @@
 
 #include <stdio.h>
+#include <stdlib.h>
 #include "x86_aout.h"
 
 #ifndef __OUT_OK