olefont: ref count cleanup

[Robert Shearman]

James Hawkins wrote:

>Changelog
>    * Use InterlockedDecrement and InterlockedIncrement instead of ++/--.
>  
>

Again, all of these patches do not fix the whole point about using the 
Interlocked* functions, which is that the variable must always be used 
*atomically*. That means if you grep the file for uses of "This->ref" 
(or the equivalent) then they should all only be as parameters to 
Interlocked* functions.

Rob