up-to-date jack2_android from OSRC(SM-G9008W_CHN).

Dear all,

I have several patches for android's support.
These patches are applied to android's domain only.

- fixed freezing issue when load/unload jack internal clients.
- fixed build error at android's X86 platform.
- do not stop jackd when busy error occurs at alsa's capture device.
- increase default allowance number of ports & clients.
- add internal clients for experiment.
- fix typos & clean-up.
- build successed at https://travis-ci.org/KimJeongYeon/jack2/builds/27956460 and my local android's build system(KiKat 4.4.2).

These patches retrieve from http://opensource.samsung.com/reception/receptionSub.do?method=sub&sub=F&searchValue=SM-G9008W.

Regards,
KimJeongYeon