rm: overriding the libc call when implementation does not match gnu coreutils exactly

[ChrisDryden]

This was originally intended to be a demonstration for how we could modify the integration tests to recognize the libc calls we were using.

I discovered that I could wrap the implementation in this helper method to be able to address this tests in a relatively readable way compared to modifying the original code.

As it stands I believe there are three skipped tests in total right now that are skipped for this reason

[github-actions[bot]]

GNU testsuite comparison:

Congrats! The gnu test tests/rm/rm-readdir-fail is now passing!

[github-actions[bot]]

GNU testsuite comparison:

Congrats! The gnu test tests/rm/rm-readdir-fail is now passing!