android toolchain and CMakeLists.txt update

cmake: android toolchain update to latest upstream and set ANDROID_DEFAULT_NDK_API_LEVEL 9
android CMakeLists.txt: added support for both 'support' and 'compatibility' in support library path for v7 appcompat
supports path styles:
$ANDROID_SDK/extras/android/support/v7/appcompat
$ANDROID_SDK/extras/android/compatibility/v7/appcompat
FreeRDP uses the environment variable ANDROID_SDK if it's not set as cmake define. - This is also used for automated building. The above two lines are required.