[PRQ#43128] Deletion Request for pypy-chainmap

MarsSeed [1] filed a deletion request for pypy-chainmap [2]: Unneeded PyPy2 / PyPy3 package; last release 2019. [a] Broken because of missing PyPy2 makedepend. "Backport/clone of ChainMap for py26, py32, and pypy3". Current PyPy2 and PyPy3 support ChainMap. And there are no old PyPy version in Arch or AUR repos. Safe to delete this. [a]: https://pypi.org/project/chainmap/ [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/pypy-chainmap/