curl is not working

### Checklist

- [x] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [x] For Python issues, I have tested with the [latest development wheel](https://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [x] I have checked the [release documentation](https://www.open3d.org/docs/release/) and the [latest documentation](https://www.open3d.org/docs/latest/) (for `main` branch).

### Describe the issue

cmake .. -DUSE_SYSTEM_CURL=ON

GOT：

-- ================================================================================
-- Open3D 0.19.0 Configuration Summary
-- ================================================================================
-- Enabled Features:
-- OpenMP .................................. ON
-- Headless Rendering ...................... OFF
-- Azure Kinect Support .................... OFF
-- Intel RealSense Support ................. OFF
-- CUDA Support ............................ OFF
-- SYCL Support ............................ OFF
-- ISPC Support ............................ ON
-- Build GUI ............................... ON
-- Build WebRTC visualizer ................. ON
-- Build Shared Library .................... OFF
-- Build Unit Tests ........................ OFF
-- Build Examples .......................... ON
-- Build Python Module ..................... ON
-- Build Jupyter Extension ................. OFF
-- Build TensorFlow Ops .................... OFF
-- Build PyTorch Ops ....................... OFF
-- Build Benchmarks ........................ OFF
-- Bundle Open3D-ML ........................ OFF
-- Force GLIBCXX_USE_CXX11_ABI= ............ 1
-- ================================================================================
-- Third-Party Dependencies:
-- Assimp .................................. yes (build from source)
-- BLAS .................................... yes
-- curl .................................... yes (build from source)
-- Eigen3 .................................. yes (build from source)
-- filament ................................ yes (build from source)
-- fmt ..................................... yes (build from source)
-- GLEW .................................... yes (build from source)
-- GLFW .................................... yes (build from source)
-- googletest .............................. no
-- imgui ................................... yes (build from source)
-- ipp ..................................... yes (build from source)
-- JPEG .................................... yes (build from source)
-- jsoncpp ................................. yes (build from source)
-- liblzf .................................. yes (build from source)
-- msgpack ................................. yes (build from source)
-- nanoflann ............................... yes (build from source)
-- OpenGL .................................. yes
-- PNG ..................................... yes (build from source)
-- qhullcpp ................................ yes (build from source)
-- librealsense ............................ no
-- TBB ..................................... yes (build from source)
-- tinyfiledialogs ......................... yes (build from source)
-- TinyGLTF ................................ yes (build from source)
-- tinyobjloader ........................... yes (build from source)
-- VTK ..................................... yes (build from source)
-- WebRTC .................................. yes (build from source)
-- ZeroMQ .................................. yes (build from source)
-- ================================================================================
-- Configuring done (4.8s)
-- Generating done (0.3s)
-- Build files have been written to: /home/dell/work/libs/Open3D/build

### Steps to reproduce the bug

```python
cmake .. -DUSE_SYSTEM_CURL=ON not working
```

### Error message

_No response_

### Expected behavior

_No response_

### Open3D, Python and System information

```markdown
- Operating system: Ubuntu 20.04 / macOS 10.15 / Windows 10 64-bit
- Python version: Python 3.8 / output from `import sys; print(sys.version)`
- Open3D version: output from python: `print(open3d.__version__)`
- System architecture: x86 / arm64 / apple-silicon / jetson / rpi
- Is this a remote workstation?: yes or no
- How did you install Open3D?: pip / conda / build from source
- Compiler version (if built from source): gcc 7.5 / clang 7.0
```

### Additional information

_No response_