build: use cpu_family for arch checks
e.g. on 32-bit arm, we may have armv6, armv7l, armv7hf, etc which all generally have the same layouts. cpu_family() groups all of these into just 'arm' that the ABI check table is expecting.
e.g. on 32-bit arm, we may have armv6, armv7l, armv7hf, etc which all generally have the same layouts. cpu_family() groups all of these into just 'arm' that the ABI check table is expecting.