- Fix cmake call

- Use correct url for sources
- Use modern cmake macro for building

- Updated to version 2.2.2:
* Requires cmake >= 3.12.
* Removed unstable continuous thumbnail creation.
- Add ffmpegthumbnailer-cmake-updates.patch: Update CMakeLists.txt
for new cmake version.
- Changes from version 2.2.1:
* CMake improvements: required CMake version is now 3.5 or newer.
* Fix anamorphic height.
* Fix libffmpegthumbnailer.pc to work with multilib systems.
* Fix rotation of 180° rotated videos.
* Fix prefer_embedded_metadata in c api.
* Fix crash when setting a log callback using the c api.
* Check for https as well when skipping stat call.
* Support specifying the size as string using the c api.
* Support raw rgb data as image type.
* Print warnings on stderr instead of stdout.
* Support for continuous thumbnail creation.