Don't change bitmap depth in wxMSW when copying it.

Sometimes, creating a DDB may fail to create the bitmap of the requested
depth and so a copy of wxBitmap could have a different depth than the original
wxBitmap.

Avoid this problem by falling back on using DIB if DDB with the right depth
couldn't be created.

Closes #11640.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76196 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add missing wxUSE_WXDIB checks.

Fix compilation with wxUSE_WXDIB==0.

Closes #16113.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76197 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775