[clang] [clang-tools-extra] Revert "[clang][analyzer] Add ReportInC99AndEarlier option to DeprecatedOrUnsafeBuf…" (PR #176603)

[Balázs Benics via cfe-commits]

steakhal wrote:

Next time put a link to the logs of the failing bot.
Potentially also sharing a tiny log snippet showcasing the failure.

https://github.com/llvm/llvm-project/pull/176603