Security update for gegl

This update for gegl fixes the following issues:

Security issue fixed:
- Fix CVE-2012-4433: Fix buffer overflow in and add plausibility checks to ppm-load op (bsc#789835).

This update was imported from the SUSE:SLE-12-SP2:Update update project.

Fixed bugs
bnc#789835
VUL-0: CVE-2012-4433: gegl: Integer overflow, leading to heap-based buffer overflow by parsing PPM image headers
Selected Binaries
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