As per design document, RTE_ARCH is the name of the architecture.
However, the definition was missing on Arm with meson build.
It impacts applications that refers to this string.
Added for Arm builds.
Fixes: b1d48c41189a ("build: support ARM with meson")
Cc: stable@dpdk.org
Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
9cc217a283