Fix setResizeAble under Linux, which had the correct implementation as a private method. Also removed the dummy implementation from DeviceStub.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@646 dfc29bdd-3216-0410-991c-e03cc46cb475

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@645 dfc29bdd-3216-0410-991c-e03cc46cb475

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@643 dfc29bdd-3216-0410-991c-e03cc46cb475