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CONTRIBUTING: update to reflect that we require a C99 compiler. [skip ci]
In particular, // comments may now be used, along with other C99 features; however, C11 or later features should not be used.
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CONTRIBUTING.md

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@@ -387,7 +387,8 @@ and ask!
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* Don't mix declarations and code.
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* Don't use `//` for comments.
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Not all C compilers accept C++/C99 comments by default.
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* tcpdump requires a compiler that supports C99 or later, so C99
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features may be used in code, but C11 or later features should not be
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used.
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* Avoid trailing tabs/spaces

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