[BusyBox] Fiddling with df...

[Rob Landley]

I have the cleaned up patch, but it blew up by 500 bytes over 1.01 (partly 
because df_main got bigger and partly because it's now pulling in things like 
bb_xgetularg_bnd_sfx()) and I'm trying to trim it back down...

However, I'd like to ask what the -t support needed for susv3 actually 
_means_.  According to the susv3 spec, it means "include total 
allocated-space figures in the output" AND that "the output format is 
unspecified when -t is used".  But what the gnu version uses -t for is to 
limit df to certain filesystem types, which has NOTHING to do with that the 
spec says -t should be for.

Considering that the gnu version doesn't support this, and that it's flagged 
as an XSI extension, and that what exactly to do with it is undefined 
anyway...

I don't think we need to do this one.  Anybody else?  (Possibly accept but 
ignore -t?)

Rob