build libandroid-backtrace

Signed-off-by: You-Sheng Yang <vicamo@gmail.com>
use gettid/tgkill inside bionic

Signed-off-by: You-Sheng Yang <vicamo@gmail.com>
bump version for v0.0.4 release

Signed-off-by: You-Sheng Yang <vicamo@gmail.com>