Darwin bindists do not install wrappers correctly

We are using cp -P to copy symlinks for the wrappers in to the correct place but on darwin this was following the symlink and copying the wrapper.

Apparently the cp utility on macs ignores -P unless -R is also passed so the fix is to pass both -R and -P on all platforms.

Worryingly CI is not affected by this, probably a result of #20131 (closed)