fixing ndk detection for r7 (non-crystax)
fixing r7 detection, making it work with crystax or regular ndk
Disabling Std.Atomic inside Boost.Asio.

With flag BOOST_ASIO_DISABLE_STD_ATOMIC inside config/user.hpp.
This is because the STL implementation seems buggy (caused deadlocks).

Did this for all supported boost versions: 1.45, 1.48, 1.49, 1.53.

For more information see this link:
https://code.google.com/p/android/issues/detail?id=42735#makechanges
Merge branch 'master' of https://github.com/paleozogt/Boost-for-Android

Conflicts:
	build-android.sh