* compile for android including armv6.
* Update arm-android.cmake
* Update from comment in the PR
support ANDROID_NATIVE_API_LEVEL from env variable. (to be able to compile also 16 and not just 21 as default)
* Add ANDROID_ARM_NEON from env var
* Short version of update ANDROID_ARM_NEON.
* remove ANDROID_NATIVE_API_LEVEL now using vcpkg_CMAKE_SYSTEM_VERSION in triplet
Add cache to ANDROID_ARM_NEON
fix indents
* Update neon triplet
* Add arm-neon-android.cmake file.
