Add failing test for cp -r dir/. symlink child.

Gentoo packages that build multiple variants, like once for every
version of a slotted dependency, currently fail to install if their
source dir includes a relative symlink to own child. Affects lots of
Python infrastructure, for example meson and setuptools. You've already
run into this issue, since cp.test has a todo. It's from 2008 though, so
I guess I'll bump with an expanded test case. Libc is musl-1.1.22.

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