Security update of potrace

This update for potrace fixes the following security issues:

- CVE-2017-12067: potential buffer overflows and arithmetic overflows (bsc#1051634)

The update also fixes various bugs, including a bug triggered by very large bitmaps.

Fixed bugs
bnc#1051634
VUL-0: CVE-2017-12067: potrace: heap-based buffer over-read in the interpolate_cubic function
Selected Binaries
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