chore: Mark include files as SYSTEM #844
Merged
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When including CLI11 in a separate project (e.g. via FetchContent) cmake will now mark the CLI11 include files as system includes, which prevents compilers from issuing any warnings for stuff it found inside these headers. This makes sure that downstream users are not confronted with potential warning messages from CLI11, regardless of what kind of obscure warnings they might have enabled for their projects.
Fixes #833