buildroot

genext2fs: needs largefile after version bump

Fixes http://autobuild.buildroot.net/results/8c7c10c0175a7ddf8e2d37a4718469d4ead3835a

And fixup space/tab mixup in Config.in while we're at it.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>