lib: fix setns() function when !HAVE_SETNS
When HAVE_SETNS is not set, iproute2 provides a local implementation of this function based on __NR_setns. This macro is defined in sys/syscall.h, which was not included, thus the local implementation always returned -1. CC: Vadim Kochan <vadim4j@gmail.com> Fixes: eb67e449 ("lib: Add netns_switch func for change network namespace") Signed-off-by:Nicolas Dichtel <nicolas.dichtel@6wind.com>
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