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Incompatibility with pypy3

See original GitHub issue

Issue description

Recent versions of pipenv no longer work with pypy3.

Expected result

Expected pipenv to work.

Actual result

❯ PYENV_VERSION=pypy3.5-6.0.0 pyenv exec pipenv --verbose
Traceback (most recent call last):
  File "/Users/ob/.pyenv/versions/pypy3.5-6.0.0/bin/pipenv", line 7, in <module>
    from pipenv import cli
  File "/Users/ob/.pyenv/versions/pypy3.5-6.0.0/site-packages/pipenv/__init__.py", line 47, in <module>
    from .cli import cli
  File "/Users/ob/.pyenv/versions/pypy3.5-6.0.0/site-packages/pipenv/cli/__init__.py", line 3, in <module>
    from .command import cli
  File "/Users/ob/.pyenv/versions/pypy3.5-6.0.0/site-packages/pipenv/cli/command.py", line 19, in <module>
    from .options import (
  File "/Users/ob/.pyenv/versions/pypy3.5-6.0.0/site-packages/pipenv/cli/options.py", line 11, in <module>
    from .. import environments
  File "/Users/ob/.pyenv/versions/pypy3.5-6.0.0/site-packages/pipenv/environments.py", line 7, in <module>
    from ._compat import fix_utf8
  File "/Users/ob/.pyenv/versions/pypy3.5-6.0.0/site-packages/pipenv/_compat.py", line 98, in <module>
    OUT_ENCODING, ERR_ENCODING = force_encoding()
  File "/Users/ob/.pyenv/versions/pypy3.5-6.0.0/site-packages/pipenv/_compat.py", line 68, in force_encoding
    from ctypes import pythonapi, py_object, c_char_p
ImportError: cannot import name 'pythonapi'

Steps to replicate

Simply install pipenv with PyPy3, then try to run any pipenv command.

pipenv --support won’t work either.

PyPy doesn’t support ctypes.pythonapi, but the root cause of the issue is that it shouldn’t even try to import this module in the first place. I’ve investigated a bit and it looks with PyPy3, sys.stdout.encoding returns "utf8" instead of "utf-8". I’m unsure whether this is a PyPy bug or not, but since pipenv used to work fine with PyPy3 prior to (I think) #3096, can we relax the condition on this line to allow for "utf8" as well as "utf-8"?