[NDK] build Android.mk now can copy Boost.Chrono to lib directory.
[build/NDK] Can clean output files and validate some NDK macros.
- Remove redundant CandyJar.cpp
[build/NDK] Android.mk rename MY_XXX to CANDY_XXX.
[Boost.DateTime/NDK] Rename module name from boost-datetime to boost-date_time.
[Build/NDK] Add all NDK libraries.