Add Android NDK build files

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
[test] Add test for J2B loader

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
[test] Add smix channel pan test

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Minor cosmetic changes

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>