[clang] [clang] move -Wcast-function-type under -Wextra (PR #77178)

[Abhin P Jose via cfe-commits]

Abhinkop wrote:

> I believe this patch is causing some issues on two PPC bots. Would you be able to help take a look? https://lab.llvm.org/buildbot/#/builders/57/builds/33601/steps/5/logs/stdio https://lab.llvm.org/buildbot/#/builders/36/builds/43759/steps/12/logs/stdio

I guess adding this flag (-Wno-cast-function-type-strict) will make the error go away. But it is caused by the conversion of the second argument "void*" to "siginfo_t *" when casting from "SignalHandlerType" i.e. "void (*__sanitizer::SignalHandlerType)(int, void *, void *);" to "void (*sa_sigaction) (int, siginfo_t *, void *);". If you are sure that this conversion is valid, I guess we can add this file. Might be similar for others.

https://github.com/llvm/llvm-project/pull/77178