Gcc 11 warning
@Spudz76 

I'm using gcc 11 and get a warning

warning: 'xmrig::kLastError' defined but not used [-Wunused-variable]                                                                                  69 | static const char* kLastError               = "lasterror";                           
      |                    ^~~~~~~~~~

can you add this fix in the next release

https://github.com/xmrig/xmrig/pull/3082/files