don't load comctl32.dll, just get the handle of the already loaded instance of it...

don't load comctl32.dll, just get the handle of the already loaded instance of it instead, this avoids accidentally loading 2 different versions of this DLL in the same process (see #10203)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56863 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775