GTK+ GUI running on Mac

I finally managed to get ghpsdr compiled and running on the Mac. There are some USB performance problems that need to be resolved, but it is running. Required changes to the semaphores (I had forgotten that the mac did not like unnamed semaphores) and the libusb_open_vid_pid does not claim the interface as it does on the Linux version.

I will try to update the repository in the next couple of days.

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