Log Message:
Update to 2.8.22

Changelog:
Overview of Changes from GIMP 2.8.20 to GIMP 2.8.22
===================================================

GUI:

 - improve drawing performance in single window mode, especially with
   pixmap themes

macOS DMG:

 - Make the launcher script also set BABL_PATH
 - Add patch for GTK+ Bug 743717 to the build which concerns crashes
   during clipboard operations with a clipboard manager active
 - Add patch for GTK+ Bug 767091 to the build which concerns crashes
   on some drag & drop operations
 - generate OSX package metadata during build

Plug-ins:

 - Fix for CVE-2007-3126, a bug in the ICO plug-in which allowed
   context-dependent attackers to cause a denial of service (crash)
   via an ICO file with an InfoHeader containing a Height of zero.
   We couldn't reproduce any crash in recent version, but fixed the
   error messages for good measure
 - Avoid creating wrong layer group structure when importing PSD
   files (already fixed in 2.8.20, didn't make it to the NEWS)
 - Prevent a crash in PDF plug-in if images or resolution are large
 - stop parsing invalid PCX files early and prevent a segmentation fault

General:

 - if NOCONFIGURE is set, autogen.sh won't run configure
 - VPATH builds for win32 targets have been fixed

Updated Translations:

 - Basque
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 - Catalan
 - Chinese (PRC)
 - Finnish
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 - Spanish
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