Include safe-read.h instead of merely declaring safe_read.

src/cat.c

@@ -32,13 +32,13 @@
 #endif
 #include "system.h"
 #include "error.h"
+#include "safe-read.h"
 
 /* Undefine, to avoid warning about redefinition on some systems.  */
 #undef max
 #define max(h,i) ((h) > (i) ? (h) : (i))
 
 int full_write ();
-int safe_read ();
 
 /* Name under which this program was invoked.  */
 char *program_name;

src/wc.c

@@ -29,12 +29,11 @@
 #include "system.h"
 #include "error.h"
 #include "human.h"
+#include "safe-read.h"
 
 /* Size of atomic reads. */
 #define BUFFER_SIZE (16 * 1024)
 
-int safe_read ();
-
 /* The name this program was run with. */
 char *program_name;