pps: Compatibility hack should be X86-specific
As of [1], using PPS_FETCH on a 64-bit ARM kernel with a 32-bit userland is broken, returning a timeout. This is because the requested 4-byte alignment for struct pps_ktime_compat (illegal on arm64) results in the timeout flags field being uninitialised. Make the hack specific to X86_64 builds with CONFIG_COMPAT defined. [1] commit c2a49fe8 ("pps: fix padding issue with PPS_FETCH for ioctl_compat") See: https://github.com/raspberrypi/linux/issues/5430 Fixes: c2a49fe8 ("pps: fix padding issue with PPS_FETCH for ioctl_compat") Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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