bug#25157: 26.0.50; whitespace-cleanup does not remove single trailing empty line anymore

[Reuben Thomas]

I attach a patch for consideration, along the lines I previously proposed. It seems to work: at least, it deletes a single trailing extra newline, while still leaving a newline at the end of the buffer, and doesn't delete a single newline at the end of the buffer.

0007-Fix-whitespace-cleanup-to-remove-single-trailing-new.patch
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