tests: eventfd: drop POSIX_API ifdeffery

Test is configured with CONFIG_POSIX_API=y, so there is no reason to
check for it being enabled in C. Additionally when CONFIG_POSIX_API=n a
much "bigger" posix/sys/socket.h was included instead of net/socket.h,
which should be rather opposite.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
1 file changed