buildroot

ghostscript: add upstream security fixes for CVE-2017-8291

CVE-2017-8291 - Artifex Ghostscript through 2017-04-26 allows -dSAFER bypass
and remote command execution via a "/OutputFile (%pipe%" substring in a
crafted .eps document that is an input to the gs program, as exploited in
the wild in April 2017.

For more details, see https://bugzilla.suse.com/show_bug.cgi?id=1036453

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>