Add cross-compiling android ndk feature #34
Description
The goal is for the user to use the cmake-gui ( or cmd line param ) to decide if it will build using android ndk.
After the user chooses,wkcmake locate android NDK, createsm a standalone toolchain, and use it to build the software.
Reference links :
http://blog.beuc.net/posts/Cross-compiling_with_CMake/
http://cganime.wordpress.com/2012/09/26/setting-up-android-standalone-toolchain-for-cmake/
http://www.cmake.org/pipermail/cmake/2012-August/051580.html
http://opekar.blogspot.kr/2010/01/building-native-libraries-for-android.html
http://android-cmake.googlecode.com/hg/documentation.html