Remove ErrorOut function

- replace the ErrorOut function with a simple return E_FAIL
- there is non reason to call some MessageBox()

CPP/7zip/Compress/Lz5Encoder.h

@@ -47,7 +47,6 @@ class CEncoder:
   UInt32 _numThreads;
 
   LZ5MT_CCtx *_ctx;
-  HRESULT CEncoder::ErrorOut(size_t code);
 
 public:
   MY_QUERYINTERFACE_BEGIN2(ICompressCoder)