[clang] [Clang][Sema] Add fortify warnings for strlcpy (PR #221325)

[Shafik Yaghmour via cfe-commits]

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@@ -234,6 +234,8 @@ features cannot lower the translation-unit ABI level;
 
 - Added support for the `__builtin_strlcat` builtin.
 
+- Added support for the `__builtin_strlcpy` builtin.
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shafik wrote:

I think it makes more sense to merge the notes into one note enumerating each builtin.

CC @AaronBallman 

https://github.com/llvm/llvm-project/pull/221325