Merged version 9 of libjpeg from vendor branch.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4553 dfc29bdd-3216-0410-991c-e03cc46cb475
Update vendor branch to zlib 1.2.8

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4554 dfc29bdd-3216-0410-991c-e03cc46cb475
Merge from vendor branch version 1.2.8 of zlib

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4555 dfc29bdd-3216-0410-991c-e03cc46cb475