Include string.h (jdassen@wi.leidenuniv.nl)

Rev: src/pad.c:1.20
Rev: src/randomness.c:1.10
Rev: src/write_buffer.c:1.13

src/pad.c

@@ -24,6 +24,7 @@
  */
 
 #include <assert.h>
+#include <string.h>
 
 #include "pad.h"
 

src/randomness.c

@@ -25,6 +25,7 @@
 
 #include <sys/types.h>
 #include <time.h>
+#include <string.h>
 
 #include "randomness.h"
 

src/write_buffer.c

@@ -28,6 +28,7 @@
 #include "xalloc.h"
 
 #include <assert.h>
+#include <string.h>
 
 /* Prototype */
 static void do_free_buffer(struct buffer_node *n);