[PATCH v2 2/2] ntdll: Deny file operations on mapping handles.

[Zebediah Figura]

Maybe this is too invasive or radical a change, but it strikes me as 
kind of weird that mapping_get_fd() [and mapping_fd_ops] exists, if the 
only purpose (at least, what seems to be the only purpose) is to pass 
the unix fd to virtual_map_section(). Maybe instead it would make more 
sense to pass that as part of the get_mapping_info request, and get rid 
of mapping fd objects altogether?