feat(zlib): update zlib source files

Upgrade the zlib source files to the ones present in the version 1.2.13
of zlib [1]. Since 1.2.11 the use of Arm crc32 instructions has been
introduced so update the files to make use of this.

[1] https://github.com/madler/zlib/tree/v1.2.13

Change-Id: Ideef78c56f05ae7daec390d00dcaa8f66b18729e
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
diff --git a/lib/zlib/inflate.h b/lib/zlib/inflate.h
index a46cce6..f127b6b 100644
--- a/lib/zlib/inflate.h
+++ b/lib/zlib/inflate.h
@@ -1,5 +1,5 @@
 /* inflate.h -- internal inflate state definition
- * Copyright (C) 1995-2016 Mark Adler
+ * Copyright (C) 1995-2019 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -86,7 +86,8 @@
     int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip,
                                    bit 2 true to validate check value */
     int havedict;               /* true if dictionary provided */
-    int flags;                  /* gzip header method and flags (0 if zlib) */
+    int flags;                  /* gzip header method and flags, 0 if zlib, or
+                                   -1 if raw or no header yet */
     unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */
     unsigned long check;        /* protected copy of check value */
     unsigned long total;        /* protected copy of output count */