[CMake] Prevent linebreaks in cmake output

[Jason Majors]

Is there a way to have each message from cmake appear on a single line?
Currently my output seems to break like this:
CMake Error: Error in cmake code at
/path/to/CMakeLists.txt:48:
Parse error.  Function missing ending ")".  End of file reached.

I'm trying to parse the error messages in a program that reads cmake's
stderr and stdout. Rather than trying to decide which lines should go
together, and building all the scanning that would be required for that, I
was hoping there might just be a flag I could set to do the work for me.

Thanks.
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