buildroot

binutils: build host-texinfo if needed

This commit adds the dependency on host-texinfo to binutils, when the
source is fetched from Git. Thanks to this, we can remove the
0800-Docs-Prevent-build-failures-when-makeinfo-is-missing.patch patch
from the ARC-specific version of binutils.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>