Merging r6173 through r6179 from trunk to ogl-es branch

- Adding optional support for touch input in X11


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6180 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CIrrDeviceLinux.h

@@ -146,6 +146,8 @@ namespace irr
 
 		void initXAtoms();
 
+		void initXInput2();
+
 		bool switchToFullscreen(bool reset=false);
 
 #ifdef _IRR_COMPILE_WITH_X11_