libtool auto detects the sysroot from gcc's parameters or configuration so we
don't need to pass in this configuration separately to libtool.
Whilst the option names do conflict with gcc/binutils, that is an issue for those
projects to resolve, not us. Upstream libtool did reject the patch. We can
drop this patch and simplify our code.
(From OE-Core rev: 7c8553f81bccc3e8c2bb1116ee1e89f5f8af4c9e)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>