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.

(cherry picked from commit 72b158095904ff50dff77506fb50b904b1175a79)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c76330784bdf0dc8422500cf37d132598041bb55..9b405a5c7e56826125f0deb5b4272eca890f4c90 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -349,7 +349,8 @@ and ask!
 
 *  Don't mix declarations and code.
 
 
 *  Don't mix declarations and code.
 

-*  Don't use `//` for comments.
-   Not all C compilers accept C++/C99 comments by default.
+*  tcpdump requires a compiler that supports C99 or later, so C99
+   features may be used in code, but C11 or later features should not be
+   used.

 
 *  Avoid trailing tabs/spaces
 
 *  Avoid trailing tabs/spaces