The open-coded architecture list pulls libatomic onto every ARM target
although ARMv6K and ARMv7 inline 64-bit atomics. ATOMIC64_DEPENDS
covers exactly the targets whose compiler emits libatomic calls.
OpenSSL's linux-armv4 and mips configurations link libatomic
regardless, so link with --as-needed to drop it where libcrypto
imports nothing from it.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>