[CMake] non-png backgrounds for dmg packages

[Brian Milco]

Hi,

First, thanks for a great tool.

I was trying to add a pdf image as a background to my dmg file and I
noticed that "png" is hard coded in the source. So I've attached a small
patch that keeps the extension from the original file. Without this patch
the pdf file does not load as the background image.

This patch was tested against 2.8.10.2.

Thanks for your time,
-Brian
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