xournal: 0.4.8 -> 0.4.8.2016

Upstream bug fixes:

  * pen and touchscreen input handling bugfixes
  * fix a minor bug with save file paths in Windows (D. German)
  * use GDK macros (not WIN32) to disable X11-specific code (T.
    Schoonjans)
  * export to PDF and printing: fix resolution loss on some pdf
    backgrounds
  * disable xinput during modal dialog boxes
  * avoid data corruption when exporting to overwrite a PDF
  * fix path search order for toolbar bitmaps
  * text and image tools activate on button release instead of button
    press to avoid subsequent confusion between clicks in toolbar and
    drawing area
  * fix "pen disable touch" when touchscreen sends prox events (A.
    Kittenberger)
  * fix crash when pasting text or images via xclip
  * updated Italian translation (Marco Ciampa)

New upstream features:

  * add space and shift-space bindings to page down/up (D. German)
  * add A5 paper (D. German)
  * config option to export successive layers to separate PDF pages
  * config option to create new file when trying to open non-existent
    .xoj

The full change log along with bug numbers can be found at:

https://sourceforge.net/p/xournal/code/ci/Release-0_4_8_2016/tree/ChangeLog

I've dropped gdk-quartz-backend.patch, because I believe it has been
fixed upstream.

Here are the upstream changes relevant for the patch (shortened, because
SourceForge has really long URLs):

  http://bit.ly/2vXW8n0 -> src/Makefile.am
  http://bit.ly/2gDnjl7 -> src/xo-file.c
  http://bit.ly/2xJ5K7A

 -> src/xo-misc.c

Tested building and using the application.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Cc: @7c6f434c, @dguibert
Cc: @johbo who has introduced the patch in #21842