[clang-tools-extra] [clang-tidy] Enable C99 in `implicit-bool-conversion` and avoid FP with `bool` operands in C23 (PR #171070)

[Baranov Victor via cfe-commits]

================
@@ -0,0 +1,43 @@
+// RUN: %check_clang_tidy -std=c99 %s readability-implicit-bool-conversion %t
----------------
vbvictor wrote:

Is there a reason to keep only c99?

https://github.com/llvm/llvm-project/pull/171070