[CMake] normalize paths

[James Bigler]

Is there a way to normalize or flatten a path to a file?

I have two paths that I need to compare:

C:\path\to\file and C:\path\to\other\..\file

I need a way to collapse the second paths into something that looks like the
first, so that I could use a string comparison on the filenames to see if
they point to the same thing.

Thanks,
James
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