[Bug target/97865] libtool needs to be updated for Darwin20.

[juergen.reuter at desy dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97865

--- Comment #14 from Jürgen Reuter <juergen.reuter at desy dot de> ---
If there is a git branch or so, I could also test it on my system with our code
whether this works as expected.