Pedantry patch from RDB: sanitise header use, correct one comment

and remove an unused variable.

[originally from svn r1243]

sshzlib.c

@@ -40,13 +40,13 @@
 #include <stdlib.h>
 #include <assert.h>
 
-/* FIXME */
-#include <windows.h>
-#include <stdio.h>
-#include "putty.h"
-
 #include "ssh.h"
 
+#ifndef FALSE
+#define FALSE 0
+#define TRUE (!FALSE)
+#endif
+
 /* ----------------------------------------------------------------------
  * Basic LZ77 code. This bit is designed modularly, so it could be
  * ripped out and used in a different LZ77 compressor. Go to it,