Linux环境使用中文字符集注册 errer code 出现 Fail to define xxx which is already defined as xxx，导致程序异常退出

[timmyyao]

Describe the bug (描述bug)
服务器上程序使用 Brpc，发现有些客户端 ssh 登录执行出现 Fail to define xxx which is already defined as xxx 并退出，定位发现是使用中文字符集导致的错误，具体错误栈如下

To Reproduce (复现方法)
(gdb) bt
#0 butil::DescribeCustomizedErrno (error_code=1002, error_name=0x7fffd2cd23da "brpc::ENOMETHOD", description=0x7fffd2cd23cb "No such method")
at ../brpc/butil/errno.cpp:47
#1 0x00007fffd23887ac in __static_initialization_and_destruction_0 (__initialize_p=1, __priority=65535) at ../brpc/brpc/controller.cpp:55
#2 0x00007fffd2388c8d in _GLOBAL__sub_I_controller.cpp(void) () at ../brpc/brpc/controller.cpp:1488
#3 0x00007ffff7dea503 in _dl_init_internal () from /lib64/ld-linux-x86-64.so.2
#4 0x00007ffff7deec16 in dl_open_worker () from /lib64/ld-linux-x86-64.so.2
#5 0x00007ffff7dea314 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#6 0x00007ffff7dee30b in _dl_open () from /lib64/ld-linux-x86-64.so.2
#7 0x00007ffff7596fbb in dlopen_doit () from /lib64/libdl.so.2
#8 0x00007ffff7dea314 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#9 0x00007ffff75975bd in _dlerror_run () from /lib64/libdl.so.2
#10 0x00007ffff7597051 in dlopen@@GLIBC_2.2.5 () from /lib64/libdl.so.2
#11 0x00007ffff6ab7a42 in os::dll_load(char const*, char*, int) () from /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.el7_4.x86_64/jre/lib/amd64/server/libjvm.so
#12 0x00007ffff68c829c in JVM_LoadLibrary () from /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.el7_4.x86_64/jre/lib/amd64/server/libjvm.so
#13 0x00007ffff53b4623 in Java_java_lang_ClassLoader_00024NativeLibrary_load () from /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.el7_4.x86_64/jre/lib/amd64/libjava.so
#14 0x00007fffe10174d4 in ?? ()
#15 0x000000076eaad100 in ?? ()
#16 0x0000000000000009 in ?? ()
#17 0x0000000771361780 in ?? ()
#18 0x00007ffff7fe8d58 in ?? ()
#19 0x0000000000000000 in ?? ()
(gdb) n
58 in ../brpc/butil/errno.cpp
1: desc = 0x7ffff00da480 "Unknown error 1002"

以上是正常的的情况，debug 可以看到 desc 内容为 "Unknown error 1002"，当使用中文字符集时，desc 内容变成 "未知的错误 1002"，找到对应代码如下，butil/errno.cpp 中，对 Linux 系统使用了字符串比较 Unknown error，导致中文字符集时程序退出

#if defined(OS_MACOSX)
const int rc = strerror_r(error_code, tls_error_buf, ERROR_BUFSIZE);
if (rc != EINVAL)
#else
desc = strerror_r(error_code, tls_error_buf, ERROR_BUFSIZE);
if (desc && strncmp(desc, "Unknown error", 13) != 0)
#endif
{
fprintf(stderr, "Fail to define %s(%d) which is already defined as `%s', abort.",
error_name, error_code, desc);
_exit(1);
}
}

Expected behavior (期望行为)
期望修改此处字符串比较的逻辑，不应依赖于特定系统语言

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

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

[tobegit3hub]

Thanks @timmyyao and +1 for this issues. We should not require users to set the error code desc as "Unknown error" which may return other unicode strings in different language. This may crash the program and we may ignore the issue by updating the code.