Merging r6275 through r6286 from trunk to ogl-es branch

- Fixing warnings
- Updating bzip2 and zlib libraries


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6287 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/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;