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CheckLanguage: hide commonly used variable names

Hannes Vogt requested to merge havogt/cmake:remove_standard_variable_names_from_check_language into master

check_language() sets internal variables with a common name in the caller's scope: result, output and content. They are now prefixed with _cl_, inspired by the CheckLibraryExists module.

Topic-rename: CheckLanguage-private-vars

Edited by Brad King

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