buildroot

e2fsprogs: disable unneeded features for host

We don't need e2initrd_helper or the test I/O manager for the host, just
like we don't need it for the target.

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
[Arnout: don't add --disable-rpath, since we *do* need rpath for the
 host; otherwise we have to explicitly pass LD_LIBRARY_PATH to be able
 to run tools linked with util-linux' libuuid/libblkid]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>