graalvm: remove derivation

This derivation was not updated since Jan 18, 2020. It doesn't
build on Hydra because it needs too much memory (~30GB). And no other
packages depend on it.

Also, this is a very complex package and really difficult to maintain.
It is a blocker for https://github.com/NixOS/nixpkgs/pull/141794, since
a recent bump of broke it.

`graalvm8-ce` is the replacement. It is much more up-to-date (`graalvm`
is on version 19.2.1, `graalvm8-ce` is on version 21.2.0), it is much
easier on Hydra (it uses the binary from Oracle).

I also deprecated `jvmci8` and `mx`. I am not sure if `graalvm8`
supplies them, but if something is missing we can always add it later to
`graalvm8-ce`.

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