This commit renames the variable _ARCH to _ARCHDIR in the libpayload build script (lpgcc) to align with the naming convention of other variables used in this file. This change improves code readability and maintainability. Change-Id: Iea4af68e49ab1cd7ec8156a14f8215244e9c0622 Signed-off-by: Subrata Banik <subratabanik@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/82479 Reviewed-by: Julius Werner <jwerner@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>