The hope is that this will make the guix compilation use the proper toolchains and not pull in symbols from glibc 2.33
> build: Adjust `qt/guix_cross_lib_path.patch`
> doc: Remove no longer needed comments
>
> Co-authored-by: fanquake <fanquake@gmail.com>
> build: Add objcopy host tool
>
> Qt's mkspec references the objcopy tool.
> build, qt: Use `mkspecs/bitcoin-linux-g++` for all Linux hosts
This is a backport of [[https://github.com/bitcoin/bitcoin/pull/25838 | core#25838]]