Update PyPy 3.x to Debian Stretch

[tianon]

The problematic .so file in PyPy3 (that links to old libssl releases) can be rebuilt pretty trivially at image build time!

(In PyPy2, the old libssl release is linked into /usr/local/bin/pypy itself, so there's nothing we can do there short of rebuilding PyPy itself.)

Closes #24 (as much as we can)

[tianon]

OH SNAP, this approach lets me finally resolve part of the s390x/ppc64le issues I was messing with in https://bitbucket.org/pypy/pypy/issues/2646!

Additional commit coming soon.

[tianon]

Updated Diff:

$ diff -u <(bashbrew cat https://github.com/docker-library/official-images/raw/master/library/pypy) <(bashbrew cat <(./generate-stackbrew-library.sh))
--- /dev/fd/63	2019-03-27 16:13:54.679987810 -0700
+++ /dev/fd/62	2019-03-27 16:13:54.683987699 -0700
@@ -3,30 +3,30 @@
 
 Tags: 2.7-7.1.0, 2.7-7.1, 2.7-7, 2.7, 2-7.1.0, 2-7.1, 2-7, 2, 2.7-7.1.0-jessie, 2.7-7.1-jessie, 2.7-7-jessie, 2.7-jessie, 2-7.1.0-jessie, 2-7.1-jessie, 2-7-jessie, 2-jessie
 Architectures: amd64, i386
-GitCommit: bcfd9f2587ef4aa818bf37eb1a6dffa348ba90cf
+GitCommit: d54416e2be73520a490eb0dd2819d8a2b4df3652
 Directory: 2.7
 
 Tags: 2.7-7.1.0-slim, 2.7-7.1-slim, 2.7-7-slim, 2.7-slim, 2-7.1.0-slim, 2-7.1-slim, 2-7-slim, 2-slim, 2.7-7.1.0-slim-jessie, 2.7-7.1-slim-jessie, 2.7-7-slim-jessie, 2.7-slim-jessie, 2-7.1.0-slim-jessie, 2-7.1-slim-jessie, 2-7-slim-jessie, 2-slim-jessie
 Architectures: amd64, i386
-GitCommit: bcfd9f2587ef4aa818bf37eb1a6dffa348ba90cf
+GitCommit: d54416e2be73520a490eb0dd2819d8a2b4df3652
 Directory: 2.7/slim
 
-Tags: 3.5-7.0.0, 3.5-7.0, 3.5-7, 3.5, 3-7.0.0, 3-7.0, 3-7, 3, latest, 3.5-7.0.0-jessie, 3.5-7.0-jessie, 3.5-7-jessie, 3.5-jessie, 3-7.0.0-jessie, 3-7.0-jessie, 3-7-jessie, 3-jessie, jessie
-Architectures: amd64, i386
-GitCommit: a25dfed4a6f684edfa44947fdb9f198962c5885a
+Tags: 3.5-7.0.0, 3.5-7.0, 3.5-7, 3.5, 3-7.0.0, 3-7.0, 3-7, 3, latest, 3.5-7.0.0-stretch, 3.5-7.0-stretch, 3.5-7-stretch, 3.5-stretch, 3-7.0.0-stretch, 3-7.0-stretch, 3-7-stretch, 3-stretch, stretch
+Architectures: amd64, i386, ppc64le, s390x
+GitCommit: b3ee440a1a459e63001454e5a9e1f20da439edab
 Directory: 3.5
 
-Tags: 3.5-7.0.0-slim, 3.5-7.0-slim, 3.5-7-slim, 3.5-slim, 3-7.0.0-slim, 3-7.0-slim, 3-7-slim, 3-slim, slim, 3.5-7.0.0-slim-jessie, 3.5-7.0-slim-jessie, 3.5-7-slim-jessie, 3.5-slim-jessie, 3-7.0.0-slim-jessie, 3-7.0-slim-jessie, 3-7-slim-jessie, 3-slim-jessie, slim-jessie
-Architectures: amd64, i386
-GitCommit: a25dfed4a6f684edfa44947fdb9f198962c5885a
+Tags: 3.5-7.0.0-slim, 3.5-7.0-slim, 3.5-7-slim, 3.5-slim, 3-7.0.0-slim, 3-7.0-slim, 3-7-slim, 3-slim, slim, 3.5-7.0.0-slim-stretch, 3.5-7.0-slim-stretch, 3.5-7-slim-stretch, 3.5-slim-stretch, 3-7.0.0-slim-stretch, 3-7.0-slim-stretch, 3-7-slim-stretch, 3-slim-stretch, slim-stretch
+Architectures: amd64, i386, ppc64le, s390x
+GitCommit: b3ee440a1a459e63001454e5a9e1f20da439edab
 Directory: 3.5/slim
 
-Tags: 3.6-7.1.0, 3.6-7.1, 3.6-7, 3.6, 3.6-7.1.0-jessie, 3.6-7.1-jessie, 3.6-7-jessie, 3.6-jessie
-Architectures: amd64, i386
-GitCommit: 6ec92626b247be066a0c89d86521a00571cc5d44
+Tags: 3.6-7.1.0, 3.6-7.1, 3.6-7, 3.6, 3.6-7.1.0-stretch, 3.6-7.1-stretch, 3.6-7-stretch, 3.6-stretch
+Architectures: amd64, i386, s390x
+GitCommit: b3ee440a1a459e63001454e5a9e1f20da439edab
 Directory: 3.6
 
-Tags: 3.6-7.1.0-slim, 3.6-7.1-slim, 3.6-7-slim, 3.6-slim, 3.6-7.1.0-slim-jessie, 3.6-7.1-slim-jessie, 3.6-7-slim-jessie, 3.6-slim-jessie
-Architectures: amd64, i386
-GitCommit: 6ec92626b247be066a0c89d86521a00571cc5d44
+Tags: 3.6-7.1.0-slim, 3.6-7.1-slim, 3.6-7-slim, 3.6-slim, 3.6-7.1.0-slim-stretch, 3.6-7.1-slim-stretch, 3.6-7-slim-stretch, 3.6-slim-stretch
+Architectures: amd64, i386, s390x
+GitCommit: b3ee440a1a459e63001454e5a9e1f20da439edab
 Directory: 3.6/slim

[yosifkit]

Looks like we always need libncurses5;

ImportError: libpanel.so.5: cannot open shared object file: No such file or directory

root@ea808e34928a:/usr/local# ls lib_pypy/*.so | xargs ldd
...
lib_pypy/_curses_cffi.pypy3-70-x86_64-linux-gnu.so:
	linux-vdso.so.1 (0x00007ffe7f9f0000)
	libncursesw.so.5 => /lib/x86_64-linux-gnu/libncursesw.so.5 (0x00007fb130c2e000)
	libtinfo.so.5 => /lib/x86_64-linux-gnu/libtinfo.so.5 (0x00007fb130a04000)
	libpanel.so.5 => not found
...