PyPy 7.3.1 (#304)

* Testing PyPy 7.3.1rc1/7.3.1rc2

* Try PyPy's fix for macOS

* 7.3.1rc3

* Update PyPy to 7.3.1

* Using latest pypywheels/manylinux2010-pypy_x86_64:2020-04-15-4ce2a6f with PyPy 7.3.1

* Rehost pypy-7.3.1 on Github to guard against bitbucket links going away

The pypy team plan to have a CDN in front of their buildbot downloads
page, but the timeline is unknown. In the meantime, this should be more
reliable than the bitbucket links!

* Updating macOS and Windows download links for PyPy to https://downloads.python.org/pypy/

Co-authored-by: Joe Rickerby <joerick@mac.com>

cibuildwheel/windows.py

@@ -47,8 +47,8 @@ def get_python_configurations(build_selector):
         PythonConfiguration(version='3.8.2', arch='32', identifier='cp38-win32', url=None),
         PythonConfiguration(version='3.8.2', arch='64', identifier='cp38-win_amd64', url=None),
         # PyPy
-        PythonConfiguration(version='2.7', arch='32', identifier='pp27-win32', url='https://bitbucket.org/pypy/pypy/downloads/pypy2.7-v7.3.0-win32.zip'),
-        PythonConfiguration(version='3.6', arch='32', identifier='pp36-win32', url='https://bitbucket.org/pypy/pypy/downloads/pypy3.6-v7.3.0-win32.zip'),
+        PythonConfiguration(version='2.7', arch='32', identifier='pp27-win32', url='https://downloads.python.org/pypy/pypy2.7-v7.3.1-win32.zip'),
+        PythonConfiguration(version='3.6', arch='32', identifier='pp36-win32', url='https://downloads.python.org/pypy/pypy3.6-v7.3.1-win32.zip'),
     ]
 
     if IS_RUNNING_ON_TRAVIS:
@@ -86,7 +86,6 @@ def install_pypy(version, arch, url):
         extract_zip(pypy_zip, os.path.dirname(installation_path))
         pypy_exe = 'pypy3.exe' if version[0] == '3' else 'pypy.exe'
         shell(['mklink', os.path.join(installation_path, 'python.exe'), os.path.join(installation_path, pypy_exe)])
-        shell(['mklink', '/d', os.path.join(installation_path, 'Scripts'), os.path.join(installation_path, 'bin')])
     return installation_path