sched.h: update header, needs size_t
sched.h: update header, needs size_t

While there, guard __clone[2] with _LIBC

Signed-off-by: Peter S. Mazinger <1f4071d9f342c1637b13af9bc258f2ff72e96758@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc