Bug#850595: cloning 843861, retitle -1 to potrace: CVE-2016-8686: memory allocation failure ..., reopening -1

[Salvatore Bonaccorso]

Control: severity -1 normal

Note that this is neither considered an issue upstream. So let's lower
severity for this issue. The CVE was sssigned most likely due to the
DoS risk, for applications using potrace. AFAICT.