Add ctypes 0.20.2

[yallop]

No description provided.

[mseri]

There is a segmentation fault on macos/arm64:

#=== ERROR while compiling ctypes.0.20.2 ======================================#
# context              2.1.4 | macos/arm64 | ocaml-base-compiler.5.0.0 | pinned(https://github.com/ocamllabs/ocaml-ctypes/archive/0.20.2.tar.gz)
# path                 ~/.opam/5.0.0/.opam-switch/build/ctypes.0.20.2
# command              ~/.opam/opam-init/hooks/sandbox.sh build make test
# exit-code            2
# env-file             ~/.opam/log/ctypes-69717-356276.env
# output-file          ~/.opam/log/ctypes-69717-356276.out
### output ###
[...]
# OK
# running test-complex
# ...
# Ran: 3 tests in: 0.00 seconds.
# OK
# running test-bools
# ..
# Ran: 2 tests in: 0.00 seconds.
# OK
# running test-callback_lifetime
# ../bin/sh: line 1: 79339 Segmentation fault: 11  CAML_LD_LIBRARY_PATH=. LD_LIBRARY_PATH=clib DYLD_LIBRARY_PATH=clib ./test-callback_lifetime.native -runner sequential
# make: *** [run-test-callback_lifetime] Error 139

In both ocaml 5.0.0 and ocaml 4.14.1 CI

[mseri]

The other interesting failure is

#=== ERROR while compiling tezos-baking-alpha.15.1 ============================#
# context              2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.4.14.1 | file:///home/opam/opam-repository
# path                 ~/.opam/4.14/.opam-switch/build/tezos-baking-alpha.15.1
# command              ~/.opam/opam-init/hooks/sandbox.sh build dune runtest -p tezos-baking-alpha -j 31
# exit-code            1
# env-file             ~/.opam/log/tezos-baking-alpha-7-6613de.env
# output-file          ~/.opam/log/tezos-baking-alpha-7-6613de.out
### output ###
# File "src/proto_alpha/lib_delegate/test/dune", line 29, characters 0-87:
# 29 | (rule
# 30 |  (alias runtest)
# 31 |  (package tezos-baking-alpha)
# 32 |  (action (run %{dep:./main.exe})))
# (cd _build/default/src/proto_alpha/lib_delegate/test && ./main.exe)
# Testing `protocol_alpha'.
# This run has ID `KA5I2ZXD'.
# 
#   [OK]          scenario          0   reaches level 5.
#   [OK]          scenario          1   scenario t1.
#   [OK]          scenario          2   scenario t2.
#   [OK]          scenario          3   scenario t3.
#   [OK]          scenario          4   scenario f2.
#   [OK]          scenario          5   scenario m1.
#   [OK]          scenario          6   scenario m2.
#   [OK]          scenario          7   scenario m3.
#   [OK]          scenario          8   scenario m4.
#   [OK]          scenario          9   scenario m5.
#   [OK]          scenario         10   scenario m6.
# > [FAIL]        scenario         11   scenario m7.
#   [OK]          scenario         12   scenario m8.
# 
# ┌──────────────────────────────────────────────────────────────────────────────┐
# │ [FAIL]        scenario         11   scenario m7.                             │
# └──────────────────────────────────────────────────────────────────────────────┘
# Checking provided seed.
# mockup client uses custom bootstrap accounts:
# name:bootstrap1
# sk_uri:unencrypted:edsk3gUfUPyBSfrS9CCgmCiQsTCHGkviBDusMxDJstFtojtc1zcpsh
# amount:4000000;
# name:bootstrap2
# sk_uri:unencrypted:edsk39qAm1fiMjgmPkw1EgQYkMzkJezLNewd7PLNHTkr6w9XA2zdfo
# amount:4000000;
# name:bootstrap3
# sk_uri:unencrypted:edsk4ArLQgBTLWG5FJmnGnT689VKoqhXwmDPBuGx3z4cvwU9MmrPZZ
# amount:4000000;
# name:bootstrap4
# sk_uri:unencrypted:edsk2uqQB9AY4FvioK2YMdfmyMrer5R8mGFyuaLLFfSRo8EoyNdht3
# amount:4000000
# 
# Error:
#   the test is taking longer than 60 seconds
#   
# 
# [exception] Alcotest_engine__Core.Make(P)(M).Test_error
#             Raised at Json_encoding.Make.destruct_obj.assoc in file "src/json_encoding.ml", line 499, characters 14-29
#             Called from Json_encoding.Make.destruct_obj.(fun) in file "src/json_encoding.ml", line 527, characters 26-43
#             
# Logs saved to `~/.opam/4.14/.opam-switch/build/tezos-baking-alpha.15.1/_build/default/src/proto_alpha/lib_delegate/test/_build/_tests/protocol_alpha/scenario.011.output'.
#  ──────────────────────────────────────────────────────────────────────────────
# 
# Full test results in `~/.opam/4.14/.opam-switch/build/tezos-baking-alpha.15.1/_build/default/src/proto_alpha/lib_delegate/test/_build/_tests/protocol_alpha'.
# 1 failure! in 192.842s. 13 tests run.

but this could be unrelated

[kit-ty-kate]

macOS/arm64 wasn't tested during the last release so this probably isn't a new problem. Let's merge for now and I've opened yallop/ocaml-ctypes#730 in hope to have that fixed for next time