FindPackageMessage: Eliminate new lines using REGEX REPLACE
Re-fix problem exposed by recent commit to FindPythonInterp. If the find "details" has new lines in it, then replace them with the empty string so that the string may be saved as a cache entry that can be re-read next time CMake runs. Use REGEX REPLACE, and replace with an empty string, eliminating the problem characters, so that we may easily extend this to include additional problem characters in the future if necessary.
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