[PATCH] commctrl: Use rbtree to keep private data instead of PropW.

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=78504

Your paranoid android.


=== debiant (32 bit report) ===

comctl32:
combo.c:556: Test failed: Expected CC32SubclassInfo property
combo.c:557: Test failed: Expected CC32SubclassInfo property
updown.c:597: Test failed: Expected CC32SubclassInfo property

=== debiant (32 bit Chinese:China report) ===

comctl32:
combo.c:556: Test failed: Expected CC32SubclassInfo property
combo.c:557: Test failed: Expected CC32SubclassInfo property
updown.c:597: Test failed: Expected CC32SubclassInfo property

=== debiant (32 bit WoW report) ===

comctl32:
combo.c:556: Test failed: Expected CC32SubclassInfo property
combo.c:557: Test failed: Expected CC32SubclassInfo property
updown.c:597: Test failed: Expected CC32SubclassInfo property

=== debiant (64 bit WoW report) ===

comctl32:
combo.c:556: Test failed: Expected CC32SubclassInfo property
combo.c:557: Test failed: Expected CC32SubclassInfo property
updown.c:597: Test failed: Expected CC32SubclassInfo property