file_read_openration.hpp has wrong #endif for non-windows compiler

[heartsg]

the second last #endif is in wrong position so that the compiler reports somewhere wrong with the last }

Anyway the file_read_operation is not implemented for non-windows environment. I am not sure whether there is any plan or not but anyway the #endif is in wrong position. It should be

} #endif #endif

but not #endif } #endif