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/bzip2/bzip2.txt

@@ -1,6 +1,6 @@
 
 NAME
-       bzip2, bunzip2 - a block-sorting file compressor, v1.0.6
+       bzip2, bunzip2 - a block-sorting file compressor, v1.0.8
        bzcat - decompresses files to stdout
        bzip2recover - recovers data from damaged bzip2 files
 
@@ -345,7 +345,7 @@ CAVEATS
        but  the  details  of  what  the problem is sometimes seem
        rather misleading.
 
-       This manual page pertains to version 1.0.6 of bzip2.  Com-
+       This manual page pertains to version 1.0.8 of bzip2.  Com-
        pressed  data created by this version is entirely forwards
        and  backwards  compatible  with   the   previous   public
        releases,  versions  0.1pl2,  0.9.0,  0.9.5, 1.0.0, 1.0.1,
@@ -367,9 +367,9 @@ CAVEATS
 
 
 AUTHOR
-       Julian Seward, jsewardbzip.org.
+       Julian Seward, jseward@acm.org
 
-       http://www.bzip.org
+       https://sourceware.org/bzip2/
 
        The ideas embodied in bzip2 are due to (at least) the fol-
        lowing  people: Michael Burrows and David Wheeler (for the