libevent: sync with oe-core move to 2.0.21 (we still at 1.4.14-fb)
libevent: sync with oe-core move to 2.0.21 (we still at 1.4.14-fb)

Signed-off-by: Marcin Juszkiewicz <c7029741245584e1c88bcae5e15b82dba628e919@linaro.org>

xleng/meta-linaro,linaro-home/meta-linaro,xleng/meta-linaro,xleng/meta-linaro,xleng/meta-linaro,linaro-home/meta-linaro,xleng/meta-linaro,linaro-home/meta-linaro,linaro-home/meta-linaro,linaro-home/meta-linaro,linaro-home/meta-linaro