Jan Kiszka authored Jan 31, 2019 and Philippe Gerum committed Apr 03, 2019

At least one arch, infamous x86, has a difference of NR_syscalls
depending on compat vs. native ABI. Account for that by introducing a
function that can deliver the currently valid syscall number if an arch
implements such a service. In all other cases, this change is
functionally no difference.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>