test: kernel/fatal changes for POSIX
test: kernel/fatal changes for POSIX

For the POSIX arch we rely on the native OS to handle
segfaults, and stack overflows.
So that we can debug them with normal native tools.
Therefore these 2 are ifdef'ed for this arch in this test

Signed-off-by: Alberto Escolar Piedras <52be3174920ed06cbdfbcf9622a1a6c68e942617@oticon.com>

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