This patch adds support for RISC-V to the grub build system. With this patch, I can successfully build grub on RISC-V as a UEFI application. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>