- link sqlite (needed for the the stdlib sqlite module)
- update nodejs to 11.x
- use default phase order (fixes linker errors during test phase)
- substitution in ./test/async/tioselectors.nim not needed anymore
- two more tests need to be disabled
- LD=$CC workaround not needed anymore
- disable unsupported tests on aarch64
- trigger pre and post hooks
- use checkInputs instead of nativeBuildInputs
- don't override patchPhase

There are many support questions when people add a new binary cache
and they suddenly lose nixos substitutions.

Most of the users want to keep that, so we're doing a breaking change.

Previously to disable all binary caches one had to do:

  nix.binaryCache = [];

Now the same is possible via:

  nix.binaryCache = lib.mkForce;

Follow up to NixOS/nixpkgs#63806, where I failed
to update the hash.

nix.binaryCaches: always set https://cache.nixos.org

nim: 0.19.4 -> 0.20.0