[CMake] Nonsensical errors returned when dlls needed for execute_process aren't found.

[James Bigler]

I've filed a bug where execute_process returns a nonsensical error code
(with no error message) when trying to run a program that can't find all the
dlls it needs to run.

http://www.vtk.org/Bug/view.php?id=9258

Has anyone else experience this?  It took me a lot of head scratching to
determine what was going wrong, because I wasn't getting reasonable error
message (or any for that matter).

James
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