GCC 8 introduced a new type of warning `-Wclass-memaccess` which
is included in `-Wall`. This warnings spits out *a million* of warnings
like the following:
```
[...]
/build/source/Source/WTF/wtf/Vector.h:128:15: warning: 'void* memcpy(void*, const void*, size_t)' writing to an object of type 'class WTF::RefPtr<WebCore::TransformOperation>' with no trivial copy-assignment; use copy-assignment or copy-initialization instead [-Wclass-memaccess]
memcpy(dst, src, reinterpret_cast<const char*>(srcEnd) - reinterpret_cast<const char*>(src));
[...]
``
Logs demonstrating the issue:
https://hydra.nixos.org/build/100205478/nixlog/1
While I don't think disabling warnings is the best way to deal with this,
there is alrady precedent for this package and I don't feel confident enough
to either patch or bump this package.
Please view this as a low-friction sub-optimal suggestion in case nobody else
has a better fix.
Currently, `setuptools` isn't propagated automatically to python
packages[1] which causes the following error when starting
`matrix-synapse`:
```
Traceback (most recent call last):
File "/nix/store/xxkds7821mrahfx75az0sq3ryf69m612-matrix-synapse-1.3.1/bin/.homeserver-wrapped", line 39, in <module>
import synapse.config.logger
File "/nix/store/xxkds7821mrahfx75az0sq3ryf69m612-matrix-synapse-1.3.1/lib/python3.7/site-packages/synapse/config/logger.py", line 27, in <module>
from synapse.app import _base as appbase
File "/nix/store/xxkds7821mrahfx75az0sq3ryf69m612-matrix-synapse-1.3.1/lib/python3.7/site-packages/synapse/app/__init__.py", line 18, in <module>
E402
File "/nix/store/xxkds7821mrahfx75az0sq3ryf69m612-matrix-synapse-1.3.1/lib/python3.7/site-packages/synapse/python_dependencies.py", line 19, in <module>
from pkg_resources import (
No module named 'pkg_resources'
```
[1] https://github.com/NixOS/nixpkgs/pull/68314
Also add a few legacy packages at version 0.11 for OCaml ≥ 4.07: configurator,
ppx_core, ppx_driver, ppx_type_conv
ocamlPackages.bap: disable for OCaml ≥ 4.07
ocamlPackages.bistro: 0.4.0 -> 0.5.0
