cmake: android toolchain update to latest upstream

AndroidToolchain.cmake: updated from https://github.com/taka-no-me/android-cmake/raw/master/android.toolchain.cmake
cmake: android toolchain 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
android toolchain: add back setting of ANDROID_SDK
android CMakeLists.txt: added else clause to test for v7 appcompat
Merge pull request #1961 from g-reno/master

android toolchain and CMakeLists.txt update