Linux/MacOSX: Erase sensitive memory explicitly instead of relying on the compiler not optimizing calls to method Memory::Erase

src/Volume/Keyfile.cpp

@@ -57,7 +57,7 @@ namespace VeraCrypt
 					break;
 			}
 
-			Memory::Erase (&keyfileData.front(), keyfileData.size());
+			burn (&keyfileData.front(), keyfileData.size());
 			goto done;
 		}