Used in compliance with POSIX 2001/2008
Fixes errors e.g.
error: implicit declaration of function 'select'
and helps with missing definitions of FD_* defines
v2: conditionally include sys/select.h, include in every test where
needed.
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Reviewed-by: Thierry Reding <thierry.reding@gmail.com> (v1)
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
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