New issue 2686: pysha3 fails tests due to mutable methods (?)
https://bitbucket.org/pypy/pypy/issues/2686/pysha3-fails-tests-due-to-mutable-methods
Michał Górny:
```
$ pypy --version
Python 2.7.13 (84a2f3e6a7f88f2fe698e473998755b3bd1a12e2, Oct 08 2017, 10:49:35)
[PyPy 5.9.0 with GCC 5.4.0]
```
O
New issue 2687: PyPy3 is missing pystrhex.h, breaking pysha3
https://bitbucket.org/pypy/pypy/issues/2687/pypy3-is-missing-pystrhexh-breaking-pysha3
Michał Górny:
```
$ pypy3 --version
Python 3.5.3 (d72f9800a42b46a8056951b1da2426d2c2d8d502, Oct 08 2017, 10:51:34)
[PyPy 5.9.0-beta0 with GCC 5.4.0]
New issue 2688: PyPy3 is missing 'Py_hexdigits' for C extensions (Py3.3),
breaking pyblake2
https://bitbucket.org/pypy/pypy/issues/2688/pypy3-is-missing-py_hexdigits-for-c
Michał Górny:
```
$ pypy3 --version
Python 3.5.3 (d72f9800a42b46a8056951b1da2426d2c2d8d502, Oct 08 2017, 10:51:34)
[PyPy 5.9
