Work around MSVC bug, and make it less likely to happen again. Ew.

MSVC insisted on using a copy assignment where a move was intended and
ought to be used.  This would have been caught, because the class in
question inherits from NonCopyable, which declares a move assignment
operator, which is supposed to delete the implicitly declared copy
assignment operator, but of course MSVC didn't do that either, causing a
class that should have been safe to be unsafe.

Source/Core/Common/Src/FileUtil.h

@@ -211,6 +211,9 @@ public:
 
 	std::FILE* m_file;
 	bool m_good;
+private:
+	IOFile(IOFile&);
+	IOFile& operator=(IOFile& other);
 };
 
 }  // namespace