Robert Maynard 47302038c1 CPack/DragNDrop: Use source file extension for background image
Instead of blindly copying the `CPACK_DMG_BACKGROUND_IMAGE` file to
`background.png`, we instead use the same file extension as the source
image.  This is needed for proper support of multi resolution `tif`
backgrounds.
2015-11-13 08:42:49 -05:00
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