Fixes the following security issues:
- CVE-2018-16543: In Artifex Ghostscript before 9.24, gssetresolution and
gsgetresolution allow attackers to have an unspecified impact
- CVE-2018-17183: Artifex Ghostscript before 9.25 allowed a user-writable
error exception table, which could be used by remote attackers able to
supply crafted PostScript to potentially overwrite or replace error
handlers to inject code.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
b054797eca