Upstream commit 11ad164bce (UefiPayloadPkg: Make UPL build script arch agnostic, 2024-02-22) changes the build script's behavior to not assume the arch. Without defining BUILD_ARCH, the build script will not function properly and results in the payload failing to build. Both UefiPayload and Universal Payload can only be built in X64. Change-Id: Icd942d0c15a99231d09f9cbdc5eb48333b6aa6e5 Signed-off-by: Nicholas Sudsgaard <devel+coreboot@nsudsgaard.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/80883 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin L Roth <gaumless@gmail.com> Reviewed-by: Sean Rhodes <sean@starlabs.systems>