feature: add PyPy 3.9

[mayeut]

Add PyPy 3.9
Also bump PyPy 3.7 & 3.8 to 7.3.8

[mayeut]

@mattip, the aarch64 builds seem to be missing all "supporting" native libraries (for all 3 versions). Was removing them done on purpose or shall I open a bug over at PyPy ?

The build is thus failing on aarch64: https://app.travis-ci.com/github/pypa/manylinux/builds/246769123

The x64 build still has the "supporting"/grafted native libraries

manylinux % find /Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib -maxdepth 1
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/tk8.5
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/tcl8.5
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libsqlite3.so.0
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libtcl8.5.so
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libtinfow.so.6
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libtk8.5.so
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/liblzma.so.5
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libncursesw.so.6
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libexpat.so.1
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/pypy3.9
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libgdbm.so.4
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libpanelw.so.6
/Users/Matt/Downloads/pypy3.9-v7.3.8-linux64/lib/libffi.so.6

The aarch64 build is missing those:

manylinux % find /Users/Matt/Downloads/pypy3.9-v7.3.8-aarch64/lib -maxdepth 1
/Users/Matt/Downloads/pypy3.9-v7.3.8-aarch64/lib
/Users/Matt/Downloads/pypy3.9-v7.3.8-aarch64/lib/pypy3.9

[mattip]

bummer. I started up a new buildbot last week and it seems I did not check well enough that the package actually works.

[mattip]

thanks for the heads up. I found the problem but it will take me a few days to get this done properly, this time with checks

[mattip]

For aarch64, please use the links with -portable in them, so https://downloads.python.org/pypy/pypy3.9-v7.3.8-aarch64-portable.tar.bz2 not https://downloads.python.org/pypy/pypy3.9-v7.3.8-aarch64.tar.bz2. The checksums are available at https://www.pypy.org/checksums.html. Sorry for the mess.

[mattip]

It seems I broke ABI compatibility between PyPy3.7-v7.3.7 and PyPy3.7-v7.3.8. I will submit a PR to back out the broken version.