Add temporary entry for ghostscript issues for -dSAFER sanbox bypasses

Actually each of the found issues should get CVE assigned, but MITRE has
not yet assigned CVEs, so for now tracking those issues under the
temporary item and BTS entry #907332.

CERT tracks this issue under: https://www.kb.cert.org/vuls/id/332928

Patches available as per

	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=b575e1ec
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=8e9ce501
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=241d9111
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=c432131c
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=e01e77a3
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=0edd3d6c
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a054156d
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=0d390118
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=c3476dde
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=b326a716
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=78911a01
	http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=5516c614

Thanks: Nicolas Braud-Santoni for starting tracking those issues.