ovr_pitch to pCreateDIBSection in DC_FUNCS. If ovr_pitch is nonzero,
it is a pitch override (specifies bytes per line), and tells to treat
the offset parameter as an already-mapped virtual memory address (if
the section parameter is zero). Fixed a DIB status init bug in
creating DIB sections from file mappings (if created from mapping, the
DIB is *not* really InSync).