ext2fs problems with buildroot

[sjhill at realitydiluted.com]

> filefrag.c:104: error: `O_LARGEFILE' undeclared (first use in this function)
> filefrag.c:104: error: (Each undeclared identifier is reported only once
> filefrag.c:104: error: for each function it appears in.)
> 
> Does anyone have any idea what may cause these errors?
> 
So, did you enable 'LARGEFILE' support in the toolchain? If not, welcome
to "Obvious Failure Land."

-S