Normalize architecture name to Debian's one
Some people use architecture name in a different manner What you must know about "arch"...
Debian: amd64 armel arm64 ppc64el
arch(1): x86_64 armv7l aarch64 ? # same as "uname -m"
Linux: x86_64 arm arm64 powerpc
Qemu: x86_64 arm aarch64 ppc64le
So, normalize it to Debian's one
Edited by Hideki Yamane