Fix loading of top to bottom BMP files in wxMSW wxBitmap.

The native LoadImage() function used by wxBMPFileHandler only supports the
standard bottom to top BMPs, fall back to our own implementation in wxImage
wxBMPHandler if it fails to also support the top to bottom ones.

Closes #13650.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76043 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix setting the label for already existing menu items with bitmaps in wxMSW.

Do update the label at Windows level if we don't use MF_OWNERDRAW style,
checking for IsOwnerDrawn() is wrong because the flag it tests may be set even
if the item is not really owner drawn from Windows point of view.

This is a mess and setting the bitmap for the existing items is still broken,
but at least setting the label works now.

See #9388.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76044 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775