Add `llvm-install-name-tool`

[tamird]

It'd be really useful to be able to use llvm-install-name-tool rather than break hermiticity by reaching for /usr/bin/install_name_tool.

[keith]

with bazel 8.x+ (I think, maybe earlier) we can actually drop all the logic that uses that tool since this codepath https://github.com/bazelbuild/rules_cc/blob/71bdd947587c95c147687d0ac2aacdd1c25e3fcd/cc/private/toolchain/unix_cc_toolchain_config.bzl#L907-L909 makes it so rewrites aren't necessary

[tamird]

Hm. I wasn't even aware of that codepath. I need to rewrite the pdfium dylib.

[keith]

Ah yea if you want to use this executable in your own action that's a different case from what I assumed you meant