BRPC cause pybind embed hang

**Describe the bug (描述bug)**

When I use brpc and pybind embed simultaneously and import numpy, the program gets stuck. However, it returns to normal once I remove the include for the brpc header file.

**To Reproduce (复现方法)**

```
#include
#include
#include

namespace py = pybind11;

int main() {
py::scoped_interpreter guard{};

auto sys = py::module_::import("sys");
std::cout << "Python version: " << sys.attr("version").cast() << std::endl;

// auto np = py::module_::import("numpy");
// std::cout << "Numpy version: " << np.attr("__version__").cast() << std::endl;

return 0;
}
```

**Expected behavior (期望行为)**

**Versions (各种版本)**
OS:
Compiler:
brpc:
protobuf:

**Additional context/screenshots (更多上下文/截图)**

Start with the minimal C++ program in the issue, including brpc/server.h and pybind11/embed.h, then compare importing sys with importing numpy and with the brpc header removed. The issue is resolved when the embedded program imports numpy and exits without hanging; compiler, OS, brpc, and protobuf versions still need to be collected.

Written by the indexing model from the issue text.