[0.4.12][COMCTL32] Fix multiple regressions v5/v6 imagelist when SxS

The problems began when we committed the two SxS commits
0.4.8-dev-502-g
7000fe2
and
0.4.8-dev-503-g
f318a25
Since then incompatible comctl32 v5/v6 imagelist were in mixed usage.

The new comctl32 patch fixes the following regressions:
- CORE-14433 MSVCPP 6 installer browseForFolder-dlg lacked icons
- CORE-14433 MS Word Viewer 2003 open-dlg lacked icons
- CORE-15118 OCR CuneiForm 12 lacked icons in the menubar
- CORE-15892 DosBOX 0.74.2 NSIS-installer lacked checkboxes
- CORE-15529 Bulk Rename utility lacked icons

Fixing comctl32 directly was applied to 0.4.12RC for the first time.
Older releases always used a partial SxS revert instead.
Master is still unpatched to date.

The fix is a combination of the first 4 commits of PR#1211 and
the attached is_valid.diff. Thanks to everyone involved:
Giannis Adamopoulos, Mark Jansen and Andreas Maier!

Author: JoachimHenze