Introduce HAVE_AOUT symbol to remove hard-coded arch list for BINFMT_AOUT
HAVE_AOUT doesn't quite do the same thing as the recently removed
ARCH_SUPPORTS_AOUT config option. That was set even on platforms where
binfmt_aout isn't supported, although it's not entirely clear why.
So it's best just to introduce a new symbol, handled consistently with
other similar HAVE_xxx symbols; with a simple 'select' in the arch Kconfig.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
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