* include/ruby/ruby.h (OBJ_WRITE): cast to (VALUE *) for second
  parameter `slot'. You don't need to write a cast (VALUE *) any more.
* class.c, compile.c, hash.c, iseq.c, proc.c, re.c, variable.c,
  vm.c, vm_method.c: remove cast expressions for OBJ_WRITE().



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41548 b2dd03c8-39d4-4d8f-98ff-823fe69b080e