[apache/incubator-teaclave] Fix rebuild packages every time (PR #589)

[Mingshen Sun <no...@github.com.INVALID>]

## Description

This PR fix building issue.

According to https://github.com/rust-lang/cargo/issues/2904, I enabled cargo log with `CARGO_LOG=cargo::core::compiler::fingerprint=trace` and see this log:

```
[2021-12-14T02:19:39Z INFO  cargo::core::compiler::fingerprint]     err: RUSTFLAGS has changed: ["--cfg", "test_mode", "--cfg", "sgx_sim", "--cfg", "executor_builtin", "--cfg", "executor_mesapy", "--cfg", "executor_wamr", "--cfg", "test_mode"] != ["--cfg", "test_mode", "--cfg", "sgx_sim", "--cfg", "executor_builtin", "--cfg", "executor_mesapy", "--cfg", "executor_wamr"]
```

I realize that this additional `test_mode` flag affect the rebuild. However, when building with `TEST_MODE=ON`, the `test_mode` flag has been added to all services. Therefore, we can safely delete this.


## Type of change (select or add applied and delete the others)

- [x] Bug fix (non-breaking change which fixes an issue)

## How has this been tested?

CI.

## Checklist

- [x] Fork the repo and create your branch from `master`.
- [x] If you've added code that should be tested, add tests.
- [x] If you've changed APIs, update the documentation.
- [x] Ensure the tests pass (see CI results).
- [x] Make sure your code lints/format.

You can view, comment on, or merge this pull request online at:

  https://github.com/apache/incubator-teaclave/pull/589

-- Commit Summary --

  * Fix rebuild packages every time

-- File Changes --

    M cmake/TeaclaveUtils.cmake (4)

-- Patch Links --

https://github.com/apache/incubator-teaclave/pull/589.patch
https://github.com/apache/incubator-teaclave/pull/589.diff

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Re: [apache/incubator-teaclave] Fix packages rebuild every time (PR #589)

[Mingshen Sun <no...@github.com.INVALID>]

Merged #589 into master.

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