Had to rename some reserved words in (maybe objc++ but possibly macros to do with xcode?) IQ3Shader::id to ID, string::verify to validate.
Put casts back into OSX driver

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2215 dfc29bdd-3216-0410-991c-e03cc46cb475