libatomic: fix aarch64 builds on NetBSD 9.x

For aarch64, GCC expects a recent version of itself that accepts
-mno-outline-atomics. Some packages pull in libatomic for aarch64,
e.g., net/haproxy for __atomic_compare_exchange_16. (haproxy was
compile tested after applying this fix.)


(gutteridge)

# $NetBSD: hacks.mk,v 1.1 2023/10/17 02:01:43 gutteridge Exp $

.if !defined(LIBATOMIC_HACKS_MK)
LIBATOMIC_HACKS_MK=	defined

# For aarch64, GCC expects a recent version of itself that accepts
# -mno-outline-atomics.
.include "../../mk/bsd.prefs.mk"
.if ${MACHINE_PLATFORM:MNetBSD-*-aarch64*} && ${OPSYS_VERSION} < 099982
GCC_REQD+=	10
PKG_HACKS+=	gcc-no-outline-atomics-required
.endif

.endif # LIBATOMIC_HACKS_MK