compat: include aio_abi.h for aio_context_t

fixes this build error on sparc64 (at least):

In file included from arch/sparc/include/asm/siginfo.h:19,
                 from include/linux/signal.h:5,
                 from include/linux/sched.h:73,
                 from arch/sparc/kernel/asm-offsets.c:13:
include/linux/compat.h:401: error: expected ')' before 'ctx_id'
include/linux/compat.h:406: error: expected ')' before 'ctx_id'

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>