[apache/incubator-teaclave-sgx-sdk] Update getrandom-sgx to v2.3 (#350)

[haerdib <no...@github.com.INVALID>]

We're currently trying to update our substrate dependencies to v4.0.0-dev (see issue https://github.com/integritee-network/worker/issues/346). But substrate now depends on hashbrown 0.11.0 which itself depends on getrandom 2.3 (same as in issue #326). We're currently in the development phase, so having our own getrandom fork and keeping it up to date all the time is not yet necessary from a security perspective. A simple patch to your [sgx-getrandom](https://github.com/mesalock-linux/getrandom-sgx) crate would be enough. 

Would it be possible to update  [sgx-getrandom](https://github.com/mesalock-linux/getrandom-sgx) to v2.3 so we can apply the patch?

Thanks alot for your help so far!

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Re: [apache/incubator-teaclave-sgx-sdk] Update getrandom-sgx to v2.3 (#350)

[clangenb <no...@github.com.INVALID>]

This is a rust-toolchain incompatibility, i.e., this feature was most-likely stabilized meanwhile. Therefore, the feature does not need to be activated explicitly.

You should run everything with the same toolchain as advised in teaclave.

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Re: [apache/incubator-teaclave-sgx-sdk] Update getrandom-sgx to v2.3 (#350)

[haerdib <no...@github.com.INVALID>]

I have forked & rebased on newest getrandom master commit: https://github.com/integritee-network/getrandom-sgx/pull/1 and I'd love to create a PR to getrandom-sgx. But I can't build it yet (& tests aren't passing) due the sampleenclave encountering the following errors:

```zsh
error[E0557]: feature has been removed
  --> /home/bhaerdi/.cargo/git/checkouts/teaclave-sgx-sdk-be25c2ad2f03718d/7c07ce0/sgx_unwind/lib.rs:24:12
   |
24 | #![feature(unwind_attributes)]
   |            ^^^^^^^^^^^^^^^^^ feature has been removed
   |
   = note: use the C-unwind ABI instead

error: cannot find attribute `unwind` in this scope
  --> /home/bhaerdi/.cargo/git/checkouts/teaclave-sgx-sdk-be25c2ad2f03718d/7c07ce0/sgx_unwind/libunwind.rs:65:7
   |
65 |     #[unwind(allowed)]
   |       ^^^^^^
```

Do you know what I'm missing here?

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