Library code from https://github.com/jaragunde/owncloud-android-library

This patch downloads, builds and installs the library from a tarball
uploaded to http://dev-www.libreoffice.org/src/.

Change-Id: I28afaea4dabe2dab869b53b1881f4d5a6522943f
Reviewed-on: https://gerrit.libreoffice.org/16190Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jacobo Aragunde Pérez <jaragunde@igalia.com>