[apache/incubator-teaclave] Rmmove unnecessary line in CMakeLists.txt (#489)

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

## Description

I'm not sure it's right, but I successfully compile it without these lines on Ubuntu20.04.2.

Fixes # (issue)

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

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
- [ ] API change with a documentation update
- [ ] Additional test coverage
- [ ] Code cleanup or just sync with upstream third-party crates

## How has this been tested?

## Checklist

- [ ] Fork the repo and create your branch from `master`.
- [ ] If you've added code that should be tested, add tests.
- [ ] If you've changed APIs, update the documentation.
- [ ] Ensure the tests pass (see CI results).
- [ ] 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/489

-- Commit Summary --

  * Rmmove unnecessary line in CMakeLists.txt

-- File Changes --

    M CMakeLists.txt (3)

-- Patch Links --

https://github.com/apache/incubator-teaclave/pull/489.patch
https://github.com/apache/incubator-teaclave/pull/489.diff

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Re: [apache/incubator-teaclave] Rmmove unnecessary line in CMakeLists.txt (#489)

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

Thanks for your contribution.

The `INTEL_SGX_SDK_FOUND` variable is set by checking if the `libsgx_urts` library is installed. Instead of simply deleting this check, can you find out the root cause of not compiling on Ubuntu 20.04.2? Thanks.

```
pkg_check_modules(INTEL_SGX_SDK QUIET libsgx_urts=2.9.101.2)
if(NOT INTEL_SGX_SDK_FOUND)
  message(FATAL_ERROR "Intel SGX SDK (version 2.9.1) is not found or version not matched.")
endif()
```

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Re: [apache/incubator-teaclave] Rmmove unnecessary line in CMakeLists.txt (#489)

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

Closed #489.

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