[CMake] Ability to tell if it is a relative path

[James Bigler]

Is there a way to discover if a path is a relative path or not?

I need to make sure that all paths are absolute for a given application, and
I can be given either relative or absolute paths to files.  If I'm given a
relative path I want to prepend ${CMAKE_CURRENT_SOURCE_DIR} to make it
absolute, but if it's already absolute, I don't want to add anything.

Thanks,
James
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