Remove pypy virtualenv copy hackery for pybind11

{

  if test "$EXTRA_INSTALL" != ""; then

    for i in $EXTRA_INSTALL ; do

      # numpypy no longer recommended: https://doc.pypy.org/en/latest/faq.html#should-i-install-numpy-or-numpypy

      # 2020-03-12 AK

      #if [ "$i" = "numpy" ] && [[ "${PY_EXE}" == pypy* ]]; then

      #  $PY_EXE -m pip install git+https://bitbucket.org/pypy/numpy.git

      if [[ "$i" = *pybind11* ]] && [[ "${PY_EXE}" == pypy* ]]; then

        # Work around https://github.com/pypa/virtualenv/issues/1198

        # (nominally fixed, but not really it appears. --Mar 28, 2020 AK)

        # Running virtualenv --always-copy or -m venv --copies should also do the trick.

        L=$(readlink .env/include)

        rm .env/include

        cp -R "$L" .env/include

         # context:

         # https://github.com/conda-forge/pyopencl-feedstock/pull/45

         # https://github.com/pybind/pybind11/pull/2146