commctrl: theming: don't determine superclass from class name

[Frank Richter]

Frank Richter <frank.richter at gmail.com>
Determining the superclass for a window subclassed for theming doesn't
work - e.g. Delphi buttons have the classname "TButton" for which no
superclass will be found. Instead, use initial subclass window procs
that have the subclass hardcoded and store it for the "real" subclass
window proc.


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