Although the strings of other languages in SentSmsCode don't
include '<!CDATA..', the Korean string does that.
Unfortunately, that string is not escaped by replaceTags().
So, the CDATA tag must be deleted.

Removing prebuilt libraries. The source code for all libraries is (and always was) available here: https://github.com/DrKLO/Telegram/tree/master/TMessagesProj/jni

Include missing unistd.h header.

On Linux unistd.h is needed for fsync().
The native library does not compile otherwise.

Thanks to https://github.com/DrKLO/Telegram/issues/738 for smart
notifications

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