* linux/arch_defs_.h [HAVE_ARCH_UNALIGNED_ACCESS] (HAVE_ARCH_UNALIGNED_ACCESS): New macro constant, defined to 1. * linux/alpha/arch_defs_.h (HAVE_ARCH_UNALIGNED_ACCESS): New macro constant, defined to 0. * linux/arm/arch_defs_.h: Likewise. * linux/powerpc/arch_defs_.h: Likewise. * linux/powerpc64/arch_defs_.h: Likewise. * linux/sparc/arch_defs_.h: Likewise.