### What this PR does / why we need it?
Add install system dependencies in install doc
Resolve:
```
$ pip install vllm==v0.7.3
CMake Error at CMakeLists.txt:14 (project):
No CMAKE_CXX_COMPILER could be found.
Tell CMake where to find the compiler by setting either the environment
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
to the compiler, or to the compiler name if it is in the PATH.
// ... ...
note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for vllm
Failed to build vllm
ERROR: Failed to build installable wheels for some pyproject.toml based projects (vllm)
```
Closes: https://github.com/vllm-project/vllm-ascend/issues/439
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
CI passed
Signed-off-by: Yikun Jiang <yikunkero@gmail.com>
c42e21a5aa