libreoffice-online/Mobile/Android

** First configure & build LibreOffice core for Android.

** cross-compile poco:

git clone https://github.com/pocoproject/poco.git
cd poco
git checkout 1.8.0

NDK=/opt/libreoffice/android-ndk-r15c
$NDK/build/tools/make-standalone-toolchain.sh --arch=arm --install-dir=`pwd`/toolchain
PATH="`pwd`/toolchain/bin:$PATH"
./configure --config=Android --no-samples --no-tests
make -s -j4 ANDROID_ABI=armeabi-v7a

lib/Android/armeabi-v7a/*.a # are the static objects we need ...

**