Fix several compiler warnings

* -Wmaybe-uninitialized
* -Wunused-parameter
* -Wunused-variable
* -Wnonnull
* -Wstringop-truncation
* -Wstringop-overflow

src/Mod/Mesh/App/WildMagic4/Wm4System.cpp

@@ -927,7 +927,7 @@ char* System::Strcpy (char* acDst, size_t uiDstSize, const char* acSrc)
         // copy failed.
         return nullptr;
     }
-    strncpy(acDst,acSrc,uiSrcLen);
+    strncpy(acDst,acSrc,uiSrcLen + 1);
     acDst[uiSrcLen] = 0;
     return acDst;
 #endif
@@ -962,7 +962,7 @@ char* System::Strcat (char* acDst, size_t uiDstSize, const char* acSrc)
         // the concatenation failed.
         return nullptr;
     }
-    strncat(acDst,acSrc,uiSrcLen);
+    strncat(acDst,acSrc,uiSrcLen + 1);
     acDst[uiSumLen] = 0;
     return acDst;
 #endif