Support clang's -fsanitize-ignorelist

A coworker asked about this option. It looks like clang renamed `-fsanitize-blacklist` to `-fsanitize-ignorelist` at some point:
https://clang.llvm.org/docs/UsersManual.html#cmdoption-fsanitize-ignorelist

[sccache already supports the old name](https://github.com/mozilla/sccache/blob/bf49d4c790a9e2ad6fefc47ec1de70ba8b8a7c4d/src/compiler/clang.rs#L233), so this should be a simple fix.