Log Message:
marco: update to 1.22.2

Change log:

### marco 1.22.2

    tx: sync with transifex
    bump LT_VERSION_INFO
    libmarco-private: add version information
    add support for invisible borders
    frames: avoid deprecated 'gtk_widget_set_double_buffered'
    window: avoid clang warning: garbage value
    ui: always set the frame background to None
    libmetacity: use cairo to render gradient
    gradient: sync code with mutter before it was removed