Setup for android(arm) build

Summary: scripts and changes to setup krita for android devices

Reviewers: vkrause, apol, Krita

Tags: Krita

Differential Revision: https://phabricator.kde.org/D19726

1. Conflicts:
2. 3rdparty/ext_exiv2/CMakeLists.txt
3. 3rdparty/ext_expat/CMakeLists.txt
4. 3rdparty/ext_lcms2/CMakeLists.txt
5. 3rdparty/ext_png/CMakeLists.txt
6. 3rdparty/ext_quazip/CMakeLists.txt
7. CMakeLists.txt
8. libs/ui/opengl/kis_opengl_canvas2.cpp