Update Zlib to version 1.2.8

third_party/zlib/inffast.c

Index: third_party/zlib/inffast.c
diff --git a/third_party/zlib/inffast.c b/third_party/zlib/inffast.c
index 2f1d60b43b8a9deacf22bb5526a979dcc219a68f..bda59ceb6a12b2d7de80ef3c1e7318e54fc979ac 100644
--- a/third_party/zlib/inffast.c
+++ b/third_party/zlib/inffast.c
@@ -1,5 +1,5 @@
 /* inffast.c -- fast decoding
- * Copyright (C) 1995-2008, 2010 Mark Adler
+ * Copyright (C) 1995-2008, 2010, 2013 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -69,8 +69,8 @@ z_streamp strm;
 unsigned start;         /* inflate()'s starting value for strm->avail_out */
 {
     struct inflate_state FAR *state;
-    unsigned char FAR *in;      /* local strm->next_in */
-    unsigned char FAR *last;    /* while in < last, enough input available */
+    z_const unsigned char FAR *in;      /* local strm->next_in */
+    z_const unsigned char FAR *last;    /* have enough input while in < last */
     unsigned char FAR *out;     /* local strm->next_out */
     unsigned char FAR *beg;     /* inflate()'s initial strm->next_out */
     unsigned char FAR *end;     /* while out < end, enough space available */