Some places were calling the meson function host_machine.system() instead of
the variables is_windows and is_linux defined in config/meson.build.

At the same time, the missing "Linux restriction" reason is added to pfe and
octeontx2 crypto PMDs.

Signed-off-by: Thomas Monjalon <redacted>
Acked-by: Bruce Richardson <redacted>

Acked-by: Anoob Joseph <redacted>