Android cmake toolchain: changed some error messages, fixed error with NDK r5, improved includes and link directories configuration
Android cmake toolchain: changed some error messages, fixed error with NDK r5, improved includes and link directories configuration

opencv/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv,opencv/opencv,apavlenko/opencv,apavlenko/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv,opencv/opencv