build: fix ODR violation
This commit fixes the regression introduced by b9df5331 that switched to the c++ static runtime and caused exceptions to be uncaught. As https://developer.android.com/ndk/guides/cpp-support.html#static_runtimes explains it, one process should *NEVER* link with more than one shared libraries that link with the c++ static library. To fix this issue: libmla and libvlc are now static and linked together as libvlcjni.so with the c++ static library.
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