fusion: CompareAssemblyIdentity() and GetAssemblyIdentityFromFile() are unused stubs and don't belong in fusion.dll. So remove them.

inetmib1: Make sure the successor to an item doesn't have an identical key as it, to prevent infinite loops in table enumeration.

wininet: Add a read-ahead buffer to allow InternetQueryDataAvailable to return the right values in chunked mode.

I just copied them from Wine's 16 pixel MS Sans Serif font.

Besides the cleanup this patch will help to implement D3DSPDM_PARTIALPRECISION 
with GL_NV_vertex_program2_option / GL_NV_fragment_program_option.