Update zlib to 1.2.11

third_party/zlib/infback.c

Index: third_party/zlib/infback.c
diff --git a/third_party/zlib/infback.c b/third_party/zlib/infback.c
index f3833c2e434a560b41325d0001c9c4ff0d5d1279..59679ecbfc5d778ca85d9ced87565f69bcb4635c 100644
--- a/third_party/zlib/infback.c
+++ b/third_party/zlib/infback.c
@@ -1,5 +1,5 @@
 /* infback.c -- inflate using a call-back interface
- * Copyright (C) 1995-2011 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -61,7 +61,7 @@ int stream_size;
     Tracev((stderr, "inflate: allocated\n"));
     strm->state = (struct internal_state FAR *)state;
     state->dmax = 32768U;
-    state->wbits = windowBits;
+    state->wbits = (uInt)windowBits;
     state->wsize = 1U << windowBits;
     state->window = window;
     state->wnext = 0;