buildroot

package/uclibc: drop BR2_TOOLCHAIN_BUILDROOT_LARGEFILE

Kill the option to build the non-largefile variant and remove the hidden
option since it's now unused.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>